diff --git a/packages/devextreme-angular/src/index.ts b/packages/devextreme-angular/src/index.ts
index 2319f8a9b38d..7bc3213a996b 100644
--- a/packages/devextreme-angular/src/index.ts
+++ b/packages/devextreme-angular/src/index.ts
@@ -84,4 +84,4 @@ export { DxValidationGroupComponent, DxValidationGroupModule } from 'devextreme-
 export { DxValidationSummaryComponent, DxValidationSummaryModule } from 'devextreme-angular/ui/validation-summary';
 export { DxValidatorComponent, DxValidatorModule } from 'devextreme-angular/ui/validator';
 export { DxVectorMapComponent, DxVectorMapModule } from 'devextreme-angular/ui/vector-map';
-export * as Common from './common/index';
+export * as Common from './common';
diff --git a/packages/devextreme-angular/src/ui/accordion/index.ts b/packages/devextreme-angular/src/ui/accordion/index.ts
index 6dc92455660b..b0b4dec1467f 100644
--- a/packages/devextreme-angular/src/ui/accordion/index.ts
+++ b/packages/devextreme-angular/src/ui/accordion/index.ts
@@ -714,8 +714,10 @@ export class DxAccordionComponent<TItem = any, TKey = any> extends DxComponent i
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiAccordionItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiAccordionItemComponent')) {
+            this.setContentChildren('items', value, 'DxiAccordionItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -725,7 +727,8 @@ export class DxAccordionComponent<TItem = any, TKey = any> extends DxComponent i
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/action-sheet/index.ts b/packages/devextreme-angular/src/ui/action-sheet/index.ts
index b8124896b9f4..607a13d6d811 100644
--- a/packages/devextreme-angular/src/ui/action-sheet/index.ts
+++ b/packages/devextreme-angular/src/ui/action-sheet/index.ts
@@ -506,8 +506,10 @@ export class DxActionSheetComponent<TItem = any, TKey = any> extends DxComponent
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiActionSheetItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiActionSheetItemComponent')) {
+            this.setContentChildren('items', value, 'DxiActionSheetItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -517,7 +519,8 @@ export class DxActionSheetComponent<TItem = any, TKey = any> extends DxComponent
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/autocomplete/index.ts b/packages/devextreme-angular/src/ui/autocomplete/index.ts
index 31fee36f04bc..70eda9dbd43a 100644
--- a/packages/devextreme-angular/src/ui/autocomplete/index.ts
+++ b/packages/devextreme-angular/src/ui/autocomplete/index.ts
@@ -1363,8 +1363,10 @@ export class DxAutocompleteComponent extends DxComponent implements OnDestroy, C
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiAutocompleteButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiAutocompleteButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiAutocompleteButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
     @ContentChildren(DxiAutocompleteItemComponent)
@@ -1372,8 +1374,10 @@ export class DxAutocompleteComponent extends DxComponent implements OnDestroy, C
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiAutocompleteItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiAutocompleteItemComponent')) {
+            this.setContentChildren('items', value, 'DxiAutocompleteItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -1383,7 +1387,8 @@ export class DxAutocompleteComponent extends DxComponent implements OnDestroy, C
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
@@ -1393,7 +1398,8 @@ export class DxAutocompleteComponent extends DxComponent implements OnDestroy, C
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/box/index.ts b/packages/devextreme-angular/src/ui/box/index.ts
index 0530be2ea9ec..a61577b1c4aa 100644
--- a/packages/devextreme-angular/src/ui/box/index.ts
+++ b/packages/devextreme-angular/src/ui/box/index.ts
@@ -419,8 +419,10 @@ export class DxBoxComponent<TItem = any, TKey = any> extends DxComponent impleme
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiBoxItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiBoxItemComponent')) {
+            this.setContentChildren('items', value, 'DxiBoxItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -430,7 +432,8 @@ export class DxBoxComponent<TItem = any, TKey = any> extends DxComponent impleme
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/button-group/index.ts b/packages/devextreme-angular/src/ui/button-group/index.ts
index dfc7d66e0db9..767c13c2c1bd 100644
--- a/packages/devextreme-angular/src/ui/button-group/index.ts
+++ b/packages/devextreme-angular/src/ui/button-group/index.ts
@@ -499,8 +499,10 @@ export class DxButtonGroupComponent extends DxComponent implements OnDestroy, On
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiButtonGroupItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiButtonGroupItemComponent')) {
+            this.setContentChildren('items', value, 'DxiButtonGroupItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -510,7 +512,8 @@ export class DxButtonGroupComponent extends DxComponent implements OnDestroy, On
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/chart/index.ts b/packages/devextreme-angular/src/ui/chart/index.ts
index 6d526b4650a0..0158577824c0 100644
--- a/packages/devextreme-angular/src/ui/chart/index.ts
+++ b/packages/devextreme-angular/src/ui/chart/index.ts
@@ -1447,8 +1447,10 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
         return this._getOption('annotations');
     }
     set annotationsChildren(value) {
-        this.setContentChildren('annotations', value, 'DxiChartAnnotationComponent');
-        this.setChildren('annotations', value);
+        if (this.checkContentChildren('annotations', value, 'DxiChartAnnotationComponent')) {
+            this.setContentChildren('annotations', value, 'DxiChartAnnotationComponent');
+            this.setChildren('annotations', value);
+        }
     }
 
     @ContentChildren(DxiChartPaneComponent)
@@ -1456,8 +1458,10 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
         return this._getOption('panes');
     }
     set panesChildren(value) {
-        this.setContentChildren('panes', value, 'DxiChartPaneComponent');
-        this.setChildren('panes', value);
+        if (this.checkContentChildren('panes', value, 'DxiChartPaneComponent')) {
+            this.setContentChildren('panes', value, 'DxiChartPaneComponent');
+            this.setChildren('panes', value);
+        }
     }
 
     @ContentChildren(DxiChartSeriesComponent)
@@ -1465,8 +1469,10 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
         return this._getOption('series');
     }
     set seriesChildren(value) {
-        this.setContentChildren('series', value, 'DxiChartSeriesComponent');
-        this.setChildren('series', value);
+        if (this.checkContentChildren('series', value, 'DxiChartSeriesComponent')) {
+            this.setContentChildren('series', value, 'DxiChartSeriesComponent');
+            this.setChildren('series', value);
+        }
     }
 
     @ContentChildren(DxiChartValueAxisComponent)
@@ -1474,8 +1480,10 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
         return this._getOption('valueAxis');
     }
     set valueAxesChildren(value) {
-        this.setContentChildren('valueAxis', value, 'DxiChartValueAxisComponent');
-        this.setChildren('valueAxis', value);
+        if (this.checkContentChildren('valueAxis', value, 'DxiChartValueAxisComponent')) {
+            this.setContentChildren('valueAxis', value, 'DxiChartValueAxisComponent');
+            this.setChildren('valueAxis', value);
+        }
     }
 
 
@@ -1485,7 +1493,8 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
     }
     set annotationsLegacyChildren(value) {
         if (this.checkContentChildren('annotations', value, 'DxiAnnotationComponent')) {
-           this.setChildren('annotations', value);
+            this.setContentChildren('annotations', value, 'DxiAnnotationComponent');
+            this.setChildren('annotations', value);
         }
     }
 
@@ -1495,7 +1504,8 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
     }
     set panesLegacyChildren(value) {
         if (this.checkContentChildren('panes', value, 'DxiPaneComponent')) {
-           this.setChildren('panes', value);
+            this.setContentChildren('panes', value, 'DxiPaneComponent');
+            this.setChildren('panes', value);
         }
     }
 
@@ -1505,7 +1515,8 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
     }
     set seriesLegacyChildren(value) {
         if (this.checkContentChildren('series', value, 'DxiSeriesComponent')) {
-           this.setChildren('series', value);
+            this.setContentChildren('series', value, 'DxiSeriesComponent');
+            this.setChildren('series', value);
         }
     }
 
@@ -1515,7 +1526,8 @@ export class DxChartComponent extends DxComponent implements OnDestroy, OnChange
     }
     set valueAxisLegacyChildren(value) {
         if (this.checkContentChildren('valueAxis', value, 'DxiValueAxisComponent')) {
-           this.setChildren('valueAxis', value);
+            this.setContentChildren('valueAxis', value, 'DxiValueAxisComponent');
+            this.setChildren('valueAxis', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/chat/index.ts b/packages/devextreme-angular/src/ui/chat/index.ts
index 00d47f0e5160..1ab0dd01639d 100644
--- a/packages/devextreme-angular/src/ui/chat/index.ts
+++ b/packages/devextreme-angular/src/ui/chat/index.ts
@@ -618,8 +618,10 @@ export class DxChatComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('alerts');
     }
     set alertsChildren(value) {
-        this.setContentChildren('alerts', value, 'DxiChatAlertComponent');
-        this.setChildren('alerts', value);
+        if (this.checkContentChildren('alerts', value, 'DxiChatAlertComponent')) {
+            this.setContentChildren('alerts', value, 'DxiChatAlertComponent');
+            this.setChildren('alerts', value);
+        }
     }
 
     @ContentChildren(DxiChatItemComponent)
@@ -627,8 +629,10 @@ export class DxChatComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiChatItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiChatItemComponent')) {
+            this.setContentChildren('items', value, 'DxiChatItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiChatTypingUserComponent)
@@ -636,8 +640,10 @@ export class DxChatComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('typingUsers');
     }
     set typingUsersChildren(value) {
-        this.setContentChildren('typingUsers', value, 'DxiChatTypingUserComponent');
-        this.setChildren('typingUsers', value);
+        if (this.checkContentChildren('typingUsers', value, 'DxiChatTypingUserComponent')) {
+            this.setContentChildren('typingUsers', value, 'DxiChatTypingUserComponent');
+            this.setChildren('typingUsers', value);
+        }
     }
 
 
@@ -647,7 +653,8 @@ export class DxChatComponent extends DxComponent implements OnDestroy, OnChanges
     }
     set alertsLegacyChildren(value) {
         if (this.checkContentChildren('alerts', value, 'DxiAlertComponent')) {
-           this.setChildren('alerts', value);
+            this.setContentChildren('alerts', value, 'DxiAlertComponent');
+            this.setChildren('alerts', value);
         }
     }
 
@@ -657,7 +664,8 @@ export class DxChatComponent extends DxComponent implements OnDestroy, OnChanges
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
@@ -667,7 +675,8 @@ export class DxChatComponent extends DxComponent implements OnDestroy, OnChanges
     }
     set typingUsersLegacyChildren(value) {
         if (this.checkContentChildren('typingUsers', value, 'DxiTypingUserComponent')) {
-           this.setChildren('typingUsers', value);
+            this.setContentChildren('typingUsers', value, 'DxiTypingUserComponent');
+            this.setChildren('typingUsers', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/color-box/index.ts b/packages/devextreme-angular/src/ui/color-box/index.ts
index ff58398230a3..31e5cd985cbf 100644
--- a/packages/devextreme-angular/src/ui/color-box/index.ts
+++ b/packages/devextreme-angular/src/ui/color-box/index.ts
@@ -1111,8 +1111,10 @@ export class DxColorBoxComponent extends DxComponent implements OnDestroy, Contr
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiColorBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiColorBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiColorBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
 
@@ -1122,7 +1124,8 @@ export class DxColorBoxComponent extends DxComponent implements OnDestroy, Contr
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/context-menu/index.ts b/packages/devextreme-angular/src/ui/context-menu/index.ts
index e5e900a726ff..1829dfa9ee80 100644
--- a/packages/devextreme-angular/src/ui/context-menu/index.ts
+++ b/packages/devextreme-angular/src/ui/context-menu/index.ts
@@ -831,8 +831,10 @@ export class DxContextMenuComponent<TKey = any> extends DxComponent implements O
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiContextMenuItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiContextMenuItemComponent')) {
+            this.setContentChildren('items', value, 'DxiContextMenuItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -842,7 +844,8 @@ export class DxContextMenuComponent<TKey = any> extends DxComponent implements O
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/data-grid/index.ts b/packages/devextreme-angular/src/ui/data-grid/index.ts
index 6d60f8d17b7b..26a8d3a8215a 100644
--- a/packages/devextreme-angular/src/ui/data-grid/index.ts
+++ b/packages/devextreme-angular/src/ui/data-grid/index.ts
@@ -2066,8 +2066,10 @@ export class DxDataGridComponent<TRowData = any, TKey = any> extends DxComponent
         return this._getOption('columns');
     }
     set columnsChildren(value) {
-        this.setContentChildren('columns', value, 'DxiDataGridColumnComponent');
-        this.setChildren('columns', value);
+        if (this.checkContentChildren('columns', value, 'DxiDataGridColumnComponent')) {
+            this.setContentChildren('columns', value, 'DxiDataGridColumnComponent');
+            this.setChildren('columns', value);
+        }
     }
 
     @ContentChildren(DxiDataGridSortByGroupSummaryInfoComponent)
@@ -2075,8 +2077,10 @@ export class DxDataGridComponent<TRowData = any, TKey = any> extends DxComponent
         return this._getOption('sortByGroupSummaryInfo');
     }
     set sortByGroupSummaryInfosChildren(value) {
-        this.setContentChildren('sortByGroupSummaryInfo', value, 'DxiDataGridSortByGroupSummaryInfoComponent');
-        this.setChildren('sortByGroupSummaryInfo', value);
+        if (this.checkContentChildren('sortByGroupSummaryInfo', value, 'DxiDataGridSortByGroupSummaryInfoComponent')) {
+            this.setContentChildren('sortByGroupSummaryInfo', value, 'DxiDataGridSortByGroupSummaryInfoComponent');
+            this.setChildren('sortByGroupSummaryInfo', value);
+        }
     }
 
 
@@ -2086,7 +2090,8 @@ export class DxDataGridComponent<TRowData = any, TKey = any> extends DxComponent
     }
     set columnsLegacyChildren(value) {
         if (this.checkContentChildren('columns', value, 'DxiColumnComponent')) {
-           this.setChildren('columns', value);
+            this.setContentChildren('columns', value, 'DxiColumnComponent');
+            this.setChildren('columns', value);
         }
     }
 
@@ -2096,7 +2101,8 @@ export class DxDataGridComponent<TRowData = any, TKey = any> extends DxComponent
     }
     set sortByGroupSummaryInfoLegacyChildren(value) {
         if (this.checkContentChildren('sortByGroupSummaryInfo', value, 'DxiSortByGroupSummaryInfoComponent')) {
-           this.setChildren('sortByGroupSummaryInfo', value);
+            this.setContentChildren('sortByGroupSummaryInfo', value, 'DxiSortByGroupSummaryInfoComponent');
+            this.setChildren('sortByGroupSummaryInfo', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/date-box/index.ts b/packages/devextreme-angular/src/ui/date-box/index.ts
index 7c5d2ee31505..b67d216c75c1 100644
--- a/packages/devextreme-angular/src/ui/date-box/index.ts
+++ b/packages/devextreme-angular/src/ui/date-box/index.ts
@@ -1426,8 +1426,10 @@ export class DxDateBoxComponent extends DxComponent implements OnDestroy, Contro
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiDateBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiDateBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiDateBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
 
@@ -1437,7 +1439,8 @@ export class DxDateBoxComponent extends DxComponent implements OnDestroy, Contro
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/date-range-box/index.ts b/packages/devextreme-angular/src/ui/date-range-box/index.ts
index a457b2e7525b..2081ecd58f83 100644
--- a/packages/devextreme-angular/src/ui/date-range-box/index.ts
+++ b/packages/devextreme-angular/src/ui/date-range-box/index.ts
@@ -1505,8 +1505,10 @@ export class DxDateRangeBoxComponent extends DxComponent implements OnDestroy, C
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiDateRangeBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiDateRangeBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiDateRangeBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
 
@@ -1516,7 +1518,8 @@ export class DxDateRangeBoxComponent extends DxComponent implements OnDestroy, C
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/diagram/index.ts b/packages/devextreme-angular/src/ui/diagram/index.ts
index be4fec2036ed..b740b0ad04b0 100644
--- a/packages/devextreme-angular/src/ui/diagram/index.ts
+++ b/packages/devextreme-angular/src/ui/diagram/index.ts
@@ -920,8 +920,10 @@ export class DxDiagramComponent extends DxComponent implements OnDestroy, OnChan
         return this._getOption('customShapes');
     }
     set customShapesChildren(value) {
-        this.setContentChildren('customShapes', value, 'DxiDiagramCustomShapeComponent');
-        this.setChildren('customShapes', value);
+        if (this.checkContentChildren('customShapes', value, 'DxiDiagramCustomShapeComponent')) {
+            this.setContentChildren('customShapes', value, 'DxiDiagramCustomShapeComponent');
+            this.setChildren('customShapes', value);
+        }
     }
 
 
@@ -931,7 +933,8 @@ export class DxDiagramComponent extends DxComponent implements OnDestroy, OnChan
     }
     set customShapesLegacyChildren(value) {
         if (this.checkContentChildren('customShapes', value, 'DxiCustomShapeComponent')) {
-           this.setChildren('customShapes', value);
+            this.setContentChildren('customShapes', value, 'DxiCustomShapeComponent');
+            this.setChildren('customShapes', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/drop-down-box/index.ts b/packages/devextreme-angular/src/ui/drop-down-box/index.ts
index e7b8e5162ff4..e978cb48e366 100644
--- a/packages/devextreme-angular/src/ui/drop-down-box/index.ts
+++ b/packages/devextreme-angular/src/ui/drop-down-box/index.ts
@@ -1176,8 +1176,10 @@ export class DxDropDownBoxComponent extends DxComponent implements OnDestroy, Co
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiDropDownBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiDropDownBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiDropDownBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
 
@@ -1187,7 +1189,8 @@ export class DxDropDownBoxComponent extends DxComponent implements OnDestroy, Co
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
@@ -1197,7 +1200,8 @@ export class DxDropDownBoxComponent extends DxComponent implements OnDestroy, Co
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/drop-down-button/index.ts b/packages/devextreme-angular/src/ui/drop-down-button/index.ts
index 38dca07540d6..a8be5442f7b4 100644
--- a/packages/devextreme-angular/src/ui/drop-down-button/index.ts
+++ b/packages/devextreme-angular/src/ui/drop-down-button/index.ts
@@ -836,8 +836,10 @@ export class DxDropDownButtonComponent extends DxComponent implements OnDestroy,
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiDropDownButtonItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiDropDownButtonItemComponent')) {
+            this.setContentChildren('items', value, 'DxiDropDownButtonItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -847,7 +849,8 @@ export class DxDropDownButtonComponent extends DxComponent implements OnDestroy,
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/filter-builder/index.ts b/packages/devextreme-angular/src/ui/filter-builder/index.ts
index e841274bae15..b8ddfff809a2 100644
--- a/packages/devextreme-angular/src/ui/filter-builder/index.ts
+++ b/packages/devextreme-angular/src/ui/filter-builder/index.ts
@@ -561,8 +561,10 @@ export class DxFilterBuilderComponent extends DxComponent implements OnDestroy,
         return this._getOption('customOperations');
     }
     set customOperationsChildren(value) {
-        this.setContentChildren('customOperations', value, 'DxiFilterBuilderCustomOperationComponent');
-        this.setChildren('customOperations', value);
+        if (this.checkContentChildren('customOperations', value, 'DxiFilterBuilderCustomOperationComponent')) {
+            this.setContentChildren('customOperations', value, 'DxiFilterBuilderCustomOperationComponent');
+            this.setChildren('customOperations', value);
+        }
     }
 
     @ContentChildren(DxiFilterBuilderFieldComponent)
@@ -570,8 +572,10 @@ export class DxFilterBuilderComponent extends DxComponent implements OnDestroy,
         return this._getOption('fields');
     }
     set fieldsChildren(value) {
-        this.setContentChildren('fields', value, 'DxiFilterBuilderFieldComponent');
-        this.setChildren('fields', value);
+        if (this.checkContentChildren('fields', value, 'DxiFilterBuilderFieldComponent')) {
+            this.setContentChildren('fields', value, 'DxiFilterBuilderFieldComponent');
+            this.setChildren('fields', value);
+        }
     }
 
 
@@ -581,7 +585,8 @@ export class DxFilterBuilderComponent extends DxComponent implements OnDestroy,
     }
     set customOperationsLegacyChildren(value) {
         if (this.checkContentChildren('customOperations', value, 'DxiCustomOperationComponent')) {
-           this.setChildren('customOperations', value);
+            this.setContentChildren('customOperations', value, 'DxiCustomOperationComponent');
+            this.setChildren('customOperations', value);
         }
     }
 
@@ -591,7 +596,8 @@ export class DxFilterBuilderComponent extends DxComponent implements OnDestroy,
     }
     set fieldsLegacyChildren(value) {
         if (this.checkContentChildren('fields', value, 'DxiFieldComponent')) {
-           this.setChildren('fields', value);
+            this.setContentChildren('fields', value, 'DxiFieldComponent');
+            this.setChildren('fields', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/form/index.ts b/packages/devextreme-angular/src/ui/form/index.ts
index 505cdf3b5e6f..c5d5f012dcbb 100644
--- a/packages/devextreme-angular/src/ui/form/index.ts
+++ b/packages/devextreme-angular/src/ui/form/index.ts
@@ -831,8 +831,10 @@ export class DxFormComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('items');
     }
     set buttonItemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiFormButtonItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiFormButtonItemComponent')) {
+            this.setContentChildren('items', value, 'DxiFormButtonItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiFormEmptyItemComponent)
@@ -840,8 +842,10 @@ export class DxFormComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('items');
     }
     set emptyItemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiFormEmptyItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiFormEmptyItemComponent')) {
+            this.setContentChildren('items', value, 'DxiFormEmptyItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiFormGroupItemComponent)
@@ -849,8 +853,10 @@ export class DxFormComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('items');
     }
     set groupItemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiFormGroupItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiFormGroupItemComponent')) {
+            this.setContentChildren('items', value, 'DxiFormGroupItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiFormItemComponent)
@@ -858,8 +864,10 @@ export class DxFormComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiFormItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiFormItemComponent')) {
+            this.setContentChildren('items', value, 'DxiFormItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiFormSimpleItemComponent)
@@ -867,8 +875,10 @@ export class DxFormComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('items');
     }
     set simpleItemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiFormSimpleItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiFormSimpleItemComponent')) {
+            this.setContentChildren('items', value, 'DxiFormSimpleItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiFormTabbedItemComponent)
@@ -876,8 +886,10 @@ export class DxFormComponent extends DxComponent implements OnDestroy, OnChanges
         return this._getOption('items');
     }
     set tabbedItemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiFormTabbedItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiFormTabbedItemComponent')) {
+            this.setContentChildren('items', value, 'DxiFormTabbedItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -887,7 +899,8 @@ export class DxFormComponent extends DxComponent implements OnDestroy, OnChanges
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/gallery/index.ts b/packages/devextreme-angular/src/ui/gallery/index.ts
index 93a21ebd9d68..694af158ef14 100644
--- a/packages/devextreme-angular/src/ui/gallery/index.ts
+++ b/packages/devextreme-angular/src/ui/gallery/index.ts
@@ -726,8 +726,10 @@ export class DxGalleryComponent<TItem = any, TKey = any> extends DxComponent imp
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiGalleryItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiGalleryItemComponent')) {
+            this.setContentChildren('items', value, 'DxiGalleryItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -737,7 +739,8 @@ export class DxGalleryComponent<TItem = any, TKey = any> extends DxComponent imp
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/gantt/index.ts b/packages/devextreme-angular/src/ui/gantt/index.ts
index ae2633e6fd0f..8d77b8139ff7 100644
--- a/packages/devextreme-angular/src/ui/gantt/index.ts
+++ b/packages/devextreme-angular/src/ui/gantt/index.ts
@@ -1186,8 +1186,10 @@ export class DxGanttComponent extends DxComponent implements OnDestroy, OnChange
         return this._getOption('columns');
     }
     set columnsChildren(value) {
-        this.setContentChildren('columns', value, 'DxiGanttColumnComponent');
-        this.setChildren('columns', value);
+        if (this.checkContentChildren('columns', value, 'DxiGanttColumnComponent')) {
+            this.setContentChildren('columns', value, 'DxiGanttColumnComponent');
+            this.setChildren('columns', value);
+        }
     }
 
     @ContentChildren(DxiGanttStripLineComponent)
@@ -1195,8 +1197,10 @@ export class DxGanttComponent extends DxComponent implements OnDestroy, OnChange
         return this._getOption('stripLines');
     }
     set stripLinesChildren(value) {
-        this.setContentChildren('stripLines', value, 'DxiGanttStripLineComponent');
-        this.setChildren('stripLines', value);
+        if (this.checkContentChildren('stripLines', value, 'DxiGanttStripLineComponent')) {
+            this.setContentChildren('stripLines', value, 'DxiGanttStripLineComponent');
+            this.setChildren('stripLines', value);
+        }
     }
 
 
@@ -1206,7 +1210,8 @@ export class DxGanttComponent extends DxComponent implements OnDestroy, OnChange
     }
     set columnsLegacyChildren(value) {
         if (this.checkContentChildren('columns', value, 'DxiColumnComponent')) {
-           this.setChildren('columns', value);
+            this.setContentChildren('columns', value, 'DxiColumnComponent');
+            this.setChildren('columns', value);
         }
     }
 
@@ -1216,7 +1221,8 @@ export class DxGanttComponent extends DxComponent implements OnDestroy, OnChange
     }
     set stripLinesLegacyChildren(value) {
         if (this.checkContentChildren('stripLines', value, 'DxiStripLineComponent')) {
-           this.setChildren('stripLines', value);
+            this.setContentChildren('stripLines', value, 'DxiStripLineComponent');
+            this.setChildren('stripLines', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/html-editor/index.ts b/packages/devextreme-angular/src/ui/html-editor/index.ts
index 90c0ec1c2e94..3f39e15b307d 100644
--- a/packages/devextreme-angular/src/ui/html-editor/index.ts
+++ b/packages/devextreme-angular/src/ui/html-editor/index.ts
@@ -852,8 +852,10 @@ export class DxHtmlEditorComponent extends DxComponent implements OnDestroy, Con
         return this._getOption('mentions');
     }
     set mentionsChildren(value) {
-        this.setContentChildren('mentions', value, 'DxiHtmlEditorMentionComponent');
-        this.setChildren('mentions', value);
+        if (this.checkContentChildren('mentions', value, 'DxiHtmlEditorMentionComponent')) {
+            this.setContentChildren('mentions', value, 'DxiHtmlEditorMentionComponent');
+            this.setChildren('mentions', value);
+        }
     }
 
 
@@ -863,7 +865,8 @@ export class DxHtmlEditorComponent extends DxComponent implements OnDestroy, Con
     }
     set mentionsLegacyChildren(value) {
         if (this.checkContentChildren('mentions', value, 'DxiMentionComponent')) {
-           this.setChildren('mentions', value);
+            this.setContentChildren('mentions', value, 'DxiMentionComponent');
+            this.setChildren('mentions', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/list/index.ts b/packages/devextreme-angular/src/ui/list/index.ts
index e33195b6ceb5..a0408e8923ce 100644
--- a/packages/devextreme-angular/src/ui/list/index.ts
+++ b/packages/devextreme-angular/src/ui/list/index.ts
@@ -1343,8 +1343,10 @@ export class DxListComponent<TItem = any, TKey = any> extends DxComponent implem
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiListItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiListItemComponent')) {
+            this.setContentChildren('items', value, 'DxiListItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiListMenuItemComponent)
@@ -1352,8 +1354,10 @@ export class DxListComponent<TItem = any, TKey = any> extends DxComponent implem
         return this._getOption('menuItems');
     }
     set menuItemsChildren(value) {
-        this.setContentChildren('menuItems', value, 'DxiListMenuItemComponent');
-        this.setChildren('menuItems', value);
+        if (this.checkContentChildren('menuItems', value, 'DxiListMenuItemComponent')) {
+            this.setContentChildren('menuItems', value, 'DxiListMenuItemComponent');
+            this.setChildren('menuItems', value);
+        }
     }
 
 
@@ -1363,7 +1367,8 @@ export class DxListComponent<TItem = any, TKey = any> extends DxComponent implem
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
@@ -1373,7 +1378,8 @@ export class DxListComponent<TItem = any, TKey = any> extends DxComponent implem
     }
     set menuItemsLegacyChildren(value) {
         if (this.checkContentChildren('menuItems', value, 'DxiMenuItemComponent')) {
-           this.setChildren('menuItems', value);
+            this.setContentChildren('menuItems', value, 'DxiMenuItemComponent');
+            this.setChildren('menuItems', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/lookup/index.ts b/packages/devextreme-angular/src/ui/lookup/index.ts
index 38b4de5b29ab..bfe0b1b897ec 100644
--- a/packages/devextreme-angular/src/ui/lookup/index.ts
+++ b/packages/devextreme-angular/src/ui/lookup/index.ts
@@ -1628,8 +1628,10 @@ export class DxLookupComponent extends DxComponent implements OnDestroy, Control
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiLookupItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiLookupItemComponent')) {
+            this.setContentChildren('items', value, 'DxiLookupItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -1639,7 +1641,8 @@ export class DxLookupComponent extends DxComponent implements OnDestroy, Control
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/map/index.ts b/packages/devextreme-angular/src/ui/map/index.ts
index 904488efc7ca..92ec8302484a 100644
--- a/packages/devextreme-angular/src/ui/map/index.ts
+++ b/packages/devextreme-angular/src/ui/map/index.ts
@@ -618,8 +618,10 @@ export class DxMapComponent extends DxComponent implements OnDestroy, OnChanges,
         return this._getOption('markers');
     }
     set markersChildren(value) {
-        this.setContentChildren('markers', value, 'DxiMapMarkerComponent');
-        this.setChildren('markers', value);
+        if (this.checkContentChildren('markers', value, 'DxiMapMarkerComponent')) {
+            this.setContentChildren('markers', value, 'DxiMapMarkerComponent');
+            this.setChildren('markers', value);
+        }
     }
 
     @ContentChildren(DxiMapRouteComponent)
@@ -627,8 +629,10 @@ export class DxMapComponent extends DxComponent implements OnDestroy, OnChanges,
         return this._getOption('routes');
     }
     set routesChildren(value) {
-        this.setContentChildren('routes', value, 'DxiMapRouteComponent');
-        this.setChildren('routes', value);
+        if (this.checkContentChildren('routes', value, 'DxiMapRouteComponent')) {
+            this.setContentChildren('routes', value, 'DxiMapRouteComponent');
+            this.setChildren('routes', value);
+        }
     }
 
 
@@ -638,7 +642,8 @@ export class DxMapComponent extends DxComponent implements OnDestroy, OnChanges,
     }
     set centerLegacyChildren(value) {
         if (this.checkContentChildren('center', value, 'DxiCenterComponent')) {
-           this.setChildren('center', value);
+            this.setContentChildren('center', value, 'DxiCenterComponent');
+            this.setChildren('center', value);
         }
     }
 
@@ -648,7 +653,8 @@ export class DxMapComponent extends DxComponent implements OnDestroy, OnChanges,
     }
     set markersLegacyChildren(value) {
         if (this.checkContentChildren('markers', value, 'DxiMarkerComponent')) {
-           this.setChildren('markers', value);
+            this.setContentChildren('markers', value, 'DxiMarkerComponent');
+            this.setChildren('markers', value);
         }
     }
 
@@ -658,7 +664,8 @@ export class DxMapComponent extends DxComponent implements OnDestroy, OnChanges,
     }
     set routesLegacyChildren(value) {
         if (this.checkContentChildren('routes', value, 'DxiRouteComponent')) {
-           this.setChildren('routes', value);
+            this.setContentChildren('routes', value, 'DxiRouteComponent');
+            this.setChildren('routes', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/menu/index.ts b/packages/devextreme-angular/src/ui/menu/index.ts
index cd91855cf623..21c2af7ab62b 100644
--- a/packages/devextreme-angular/src/ui/menu/index.ts
+++ b/packages/devextreme-angular/src/ui/menu/index.ts
@@ -800,8 +800,10 @@ export class DxMenuComponent<TKey = any> extends DxComponent implements OnDestro
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiMenuItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiMenuItemComponent')) {
+            this.setContentChildren('items', value, 'DxiMenuItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -811,7 +813,8 @@ export class DxMenuComponent<TKey = any> extends DxComponent implements OnDestro
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/multi-view/index.ts b/packages/devextreme-angular/src/ui/multi-view/index.ts
index b586263e14b2..c62bed710cd0 100644
--- a/packages/devextreme-angular/src/ui/multi-view/index.ts
+++ b/packages/devextreme-angular/src/ui/multi-view/index.ts
@@ -606,8 +606,10 @@ export class DxMultiViewComponent<TItem = any, TKey = any> extends DxComponent i
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiMultiViewItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiMultiViewItemComponent')) {
+            this.setContentChildren('items', value, 'DxiMultiViewItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -617,7 +619,8 @@ export class DxMultiViewComponent<TItem = any, TKey = any> extends DxComponent i
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/number-box/index.ts b/packages/devextreme-angular/src/ui/number-box/index.ts
index da92d1b40943..f97e5d2519df 100644
--- a/packages/devextreme-angular/src/ui/number-box/index.ts
+++ b/packages/devextreme-angular/src/ui/number-box/index.ts
@@ -999,8 +999,10 @@ export class DxNumberBoxComponent extends DxComponent implements OnDestroy, Cont
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiNumberBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiNumberBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiNumberBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
 
@@ -1010,7 +1012,8 @@ export class DxNumberBoxComponent extends DxComponent implements OnDestroy, Cont
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/pie-chart/index.ts b/packages/devextreme-angular/src/ui/pie-chart/index.ts
index 204333de521e..2837e6a11486 100644
--- a/packages/devextreme-angular/src/ui/pie-chart/index.ts
+++ b/packages/devextreme-angular/src/ui/pie-chart/index.ts
@@ -980,8 +980,10 @@ export class DxPieChartComponent extends DxComponent implements OnDestroy, OnCha
         return this._getOption('annotations');
     }
     set annotationsChildren(value) {
-        this.setContentChildren('annotations', value, 'DxiPieChartAnnotationComponent');
-        this.setChildren('annotations', value);
+        if (this.checkContentChildren('annotations', value, 'DxiPieChartAnnotationComponent')) {
+            this.setContentChildren('annotations', value, 'DxiPieChartAnnotationComponent');
+            this.setChildren('annotations', value);
+        }
     }
 
     @ContentChildren(DxiPieChartSeriesComponent)
@@ -989,8 +991,10 @@ export class DxPieChartComponent extends DxComponent implements OnDestroy, OnCha
         return this._getOption('series');
     }
     set seriesChildren(value) {
-        this.setContentChildren('series', value, 'DxiPieChartSeriesComponent');
-        this.setChildren('series', value);
+        if (this.checkContentChildren('series', value, 'DxiPieChartSeriesComponent')) {
+            this.setContentChildren('series', value, 'DxiPieChartSeriesComponent');
+            this.setChildren('series', value);
+        }
     }
 
 
@@ -1000,7 +1004,8 @@ export class DxPieChartComponent extends DxComponent implements OnDestroy, OnCha
     }
     set annotationsLegacyChildren(value) {
         if (this.checkContentChildren('annotations', value, 'DxiAnnotationComponent')) {
-           this.setChildren('annotations', value);
+            this.setContentChildren('annotations', value, 'DxiAnnotationComponent');
+            this.setChildren('annotations', value);
         }
     }
 
@@ -1010,7 +1015,8 @@ export class DxPieChartComponent extends DxComponent implements OnDestroy, OnCha
     }
     set seriesLegacyChildren(value) {
         if (this.checkContentChildren('series', value, 'DxiSeriesComponent')) {
-           this.setChildren('series', value);
+            this.setContentChildren('series', value, 'DxiSeriesComponent');
+            this.setChildren('series', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/polar-chart/index.ts b/packages/devextreme-angular/src/ui/polar-chart/index.ts
index 4882b6ca7db3..07fc21aba420 100644
--- a/packages/devextreme-angular/src/ui/polar-chart/index.ts
+++ b/packages/devextreme-angular/src/ui/polar-chart/index.ts
@@ -1125,8 +1125,10 @@ export class DxPolarChartComponent extends DxComponent implements OnDestroy, OnC
         return this._getOption('annotations');
     }
     set annotationsChildren(value) {
-        this.setContentChildren('annotations', value, 'DxiPolarChartAnnotationComponent');
-        this.setChildren('annotations', value);
+        if (this.checkContentChildren('annotations', value, 'DxiPolarChartAnnotationComponent')) {
+            this.setContentChildren('annotations', value, 'DxiPolarChartAnnotationComponent');
+            this.setChildren('annotations', value);
+        }
     }
 
     @ContentChildren(DxiPolarChartSeriesComponent)
@@ -1134,8 +1136,10 @@ export class DxPolarChartComponent extends DxComponent implements OnDestroy, OnC
         return this._getOption('series');
     }
     set seriesChildren(value) {
-        this.setContentChildren('series', value, 'DxiPolarChartSeriesComponent');
-        this.setChildren('series', value);
+        if (this.checkContentChildren('series', value, 'DxiPolarChartSeriesComponent')) {
+            this.setContentChildren('series', value, 'DxiPolarChartSeriesComponent');
+            this.setChildren('series', value);
+        }
     }
 
 
@@ -1145,7 +1149,8 @@ export class DxPolarChartComponent extends DxComponent implements OnDestroy, OnC
     }
     set annotationsLegacyChildren(value) {
         if (this.checkContentChildren('annotations', value, 'DxiAnnotationComponent')) {
-           this.setChildren('annotations', value);
+            this.setContentChildren('annotations', value, 'DxiAnnotationComponent');
+            this.setChildren('annotations', value);
         }
     }
 
@@ -1155,7 +1160,8 @@ export class DxPolarChartComponent extends DxComponent implements OnDestroy, OnC
     }
     set seriesLegacyChildren(value) {
         if (this.checkContentChildren('series', value, 'DxiSeriesComponent')) {
-           this.setChildren('series', value);
+            this.setContentChildren('series', value, 'DxiSeriesComponent');
+            this.setChildren('series', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/popover/index.ts b/packages/devextreme-angular/src/ui/popover/index.ts
index ecc68f7f6d96..0c25d6780ae8 100644
--- a/packages/devextreme-angular/src/ui/popover/index.ts
+++ b/packages/devextreme-angular/src/ui/popover/index.ts
@@ -792,8 +792,10 @@ export class DxPopoverComponent extends DxComponent implements OnDestroy, OnChan
         return this._getOption('toolbarItems');
     }
     set toolbarItemsChildren(value) {
-        this.setContentChildren('toolbarItems', value, 'DxiPopoverToolbarItemComponent');
-        this.setChildren('toolbarItems', value);
+        if (this.checkContentChildren('toolbarItems', value, 'DxiPopoverToolbarItemComponent')) {
+            this.setContentChildren('toolbarItems', value, 'DxiPopoverToolbarItemComponent');
+            this.setChildren('toolbarItems', value);
+        }
     }
 
 
diff --git a/packages/devextreme-angular/src/ui/popup/component.ts b/packages/devextreme-angular/src/ui/popup/component.ts
index 5605258d13af..4240e231e7d0 100644
--- a/packages/devextreme-angular/src/ui/popup/component.ts
+++ b/packages/devextreme-angular/src/ui/popup/component.ts
@@ -932,8 +932,10 @@ export class DxPopupComponent extends DxComponent implements OnDestroy, OnChange
         return this._getOption('toolbarItems');
     }
     set toolbarItemsChildren(value) {
-        this.setContentChildren('toolbarItems', value, 'DxiPopupToolbarItemComponent');
-        this.setChildren('toolbarItems', value);
+        if (this.checkContentChildren('toolbarItems', value, 'DxiPopupToolbarItemComponent')) {
+            this.setContentChildren('toolbarItems', value, 'DxiPopupToolbarItemComponent');
+            this.setChildren('toolbarItems', value);
+        }
     }
 
 
diff --git a/packages/devextreme-angular/src/ui/radio-group/index.ts b/packages/devextreme-angular/src/ui/radio-group/index.ts
index d427bc25e307..074983b4b8f8 100644
--- a/packages/devextreme-angular/src/ui/radio-group/index.ts
+++ b/packages/devextreme-angular/src/ui/radio-group/index.ts
@@ -698,8 +698,10 @@ export class DxRadioGroupComponent extends DxComponent implements OnDestroy, Con
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiRadioGroupItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiRadioGroupItemComponent')) {
+            this.setContentChildren('items', value, 'DxiRadioGroupItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -709,7 +711,8 @@ export class DxRadioGroupComponent extends DxComponent implements OnDestroy, Con
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/responsive-box/index.ts b/packages/devextreme-angular/src/ui/responsive-box/index.ts
index c869137924e5..11a83674f490 100644
--- a/packages/devextreme-angular/src/ui/responsive-box/index.ts
+++ b/packages/devextreme-angular/src/ui/responsive-box/index.ts
@@ -448,8 +448,10 @@ export class DxResponsiveBoxComponent<TItem = any, TKey = any> extends DxCompone
         return this._getOption('cols');
     }
     set colsChildren(value) {
-        this.setContentChildren('cols', value, 'DxiResponsiveBoxColComponent');
-        this.setChildren('cols', value);
+        if (this.checkContentChildren('cols', value, 'DxiResponsiveBoxColComponent')) {
+            this.setContentChildren('cols', value, 'DxiResponsiveBoxColComponent');
+            this.setChildren('cols', value);
+        }
     }
 
     @ContentChildren(DxiResponsiveBoxItemComponent)
@@ -457,8 +459,10 @@ export class DxResponsiveBoxComponent<TItem = any, TKey = any> extends DxCompone
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiResponsiveBoxItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiResponsiveBoxItemComponent')) {
+            this.setContentChildren('items', value, 'DxiResponsiveBoxItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
     @ContentChildren(DxiResponsiveBoxRowComponent)
@@ -466,8 +470,10 @@ export class DxResponsiveBoxComponent<TItem = any, TKey = any> extends DxCompone
         return this._getOption('rows');
     }
     set rowsChildren(value) {
-        this.setContentChildren('rows', value, 'DxiResponsiveBoxRowComponent');
-        this.setChildren('rows', value);
+        if (this.checkContentChildren('rows', value, 'DxiResponsiveBoxRowComponent')) {
+            this.setContentChildren('rows', value, 'DxiResponsiveBoxRowComponent');
+            this.setChildren('rows', value);
+        }
     }
 
 
@@ -477,7 +483,8 @@ export class DxResponsiveBoxComponent<TItem = any, TKey = any> extends DxCompone
     }
     set colsLegacyChildren(value) {
         if (this.checkContentChildren('cols', value, 'DxiColComponent')) {
-           this.setChildren('cols', value);
+            this.setContentChildren('cols', value, 'DxiColComponent');
+            this.setChildren('cols', value);
         }
     }
 
@@ -487,7 +494,8 @@ export class DxResponsiveBoxComponent<TItem = any, TKey = any> extends DxCompone
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
@@ -497,7 +505,8 @@ export class DxResponsiveBoxComponent<TItem = any, TKey = any> extends DxCompone
     }
     set rowsLegacyChildren(value) {
         if (this.checkContentChildren('rows', value, 'DxiRowComponent')) {
-           this.setChildren('rows', value);
+            this.setContentChildren('rows', value, 'DxiRowComponent');
+            this.setChildren('rows', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/scheduler/index.ts b/packages/devextreme-angular/src/ui/scheduler/index.ts
index b1ceeb417a34..41916abe1d1e 100644
--- a/packages/devextreme-angular/src/ui/scheduler/index.ts
+++ b/packages/devextreme-angular/src/ui/scheduler/index.ts
@@ -1434,8 +1434,10 @@ export class DxSchedulerComponent extends DxComponent implements OnDestroy, OnCh
         return this._getOption('resources');
     }
     set resourcesChildren(value) {
-        this.setContentChildren('resources', value, 'DxiSchedulerResourceComponent');
-        this.setChildren('resources', value);
+        if (this.checkContentChildren('resources', value, 'DxiSchedulerResourceComponent')) {
+            this.setContentChildren('resources', value, 'DxiSchedulerResourceComponent');
+            this.setChildren('resources', value);
+        }
     }
 
     @ContentChildren(DxiSchedulerViewComponent)
@@ -1443,8 +1445,10 @@ export class DxSchedulerComponent extends DxComponent implements OnDestroy, OnCh
         return this._getOption('views');
     }
     set viewsChildren(value) {
-        this.setContentChildren('views', value, 'DxiSchedulerViewComponent');
-        this.setChildren('views', value);
+        if (this.checkContentChildren('views', value, 'DxiSchedulerViewComponent')) {
+            this.setContentChildren('views', value, 'DxiSchedulerViewComponent');
+            this.setChildren('views', value);
+        }
     }
 
 
@@ -1454,7 +1458,8 @@ export class DxSchedulerComponent extends DxComponent implements OnDestroy, OnCh
     }
     set resourcesLegacyChildren(value) {
         if (this.checkContentChildren('resources', value, 'DxiResourceComponent')) {
-           this.setChildren('resources', value);
+            this.setContentChildren('resources', value, 'DxiResourceComponent');
+            this.setChildren('resources', value);
         }
     }
 
@@ -1464,7 +1469,8 @@ export class DxSchedulerComponent extends DxComponent implements OnDestroy, OnCh
     }
     set viewsLegacyChildren(value) {
         if (this.checkContentChildren('views', value, 'DxiViewComponent')) {
-           this.setChildren('views', value);
+            this.setContentChildren('views', value, 'DxiViewComponent');
+            this.setChildren('views', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/select-box/index.ts b/packages/devextreme-angular/src/ui/select-box/index.ts
index 1f924f35bf68..13a3cfec7cb6 100644
--- a/packages/devextreme-angular/src/ui/select-box/index.ts
+++ b/packages/devextreme-angular/src/ui/select-box/index.ts
@@ -1513,8 +1513,10 @@ export class DxSelectBoxComponent extends DxComponent implements OnDestroy, Cont
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiSelectBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiSelectBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiSelectBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
     @ContentChildren(DxiSelectBoxItemComponent)
@@ -1522,8 +1524,10 @@ export class DxSelectBoxComponent extends DxComponent implements OnDestroy, Cont
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiSelectBoxItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiSelectBoxItemComponent')) {
+            this.setContentChildren('items', value, 'DxiSelectBoxItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -1533,7 +1537,8 @@ export class DxSelectBoxComponent extends DxComponent implements OnDestroy, Cont
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
@@ -1543,7 +1548,8 @@ export class DxSelectBoxComponent extends DxComponent implements OnDestroy, Cont
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/splitter/index.ts b/packages/devextreme-angular/src/ui/splitter/index.ts
index c700134759db..14d5abd56d16 100644
--- a/packages/devextreme-angular/src/ui/splitter/index.ts
+++ b/packages/devextreme-angular/src/ui/splitter/index.ts
@@ -432,8 +432,10 @@ export class DxSplitterComponent<TItem = any, TKey = any> extends DxComponent im
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiSplitterItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiSplitterItemComponent')) {
+            this.setContentChildren('items', value, 'DxiSplitterItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -443,7 +445,8 @@ export class DxSplitterComponent<TItem = any, TKey = any> extends DxComponent im
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/tab-panel/index.ts b/packages/devextreme-angular/src/ui/tab-panel/index.ts
index 35b1cad60c16..ac65969855da 100644
--- a/packages/devextreme-angular/src/ui/tab-panel/index.ts
+++ b/packages/devextreme-angular/src/ui/tab-panel/index.ts
@@ -799,8 +799,10 @@ export class DxTabPanelComponent<TItem = any, TKey = any> extends DxComponent im
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiTabPanelItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiTabPanelItemComponent')) {
+            this.setContentChildren('items', value, 'DxiTabPanelItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -810,7 +812,8 @@ export class DxTabPanelComponent<TItem = any, TKey = any> extends DxComponent im
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/tabs/index.ts b/packages/devextreme-angular/src/ui/tabs/index.ts
index ce5b4da56dbe..ce3c614207bc 100644
--- a/packages/devextreme-angular/src/ui/tabs/index.ts
+++ b/packages/devextreme-angular/src/ui/tabs/index.ts
@@ -735,8 +735,10 @@ export class DxTabsComponent<TItem = any, TKey = any> extends DxComponent implem
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiTabsItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiTabsItemComponent')) {
+            this.setContentChildren('items', value, 'DxiTabsItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -746,7 +748,8 @@ export class DxTabsComponent<TItem = any, TKey = any> extends DxComponent implem
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/tag-box/index.ts b/packages/devextreme-angular/src/ui/tag-box/index.ts
index 1af6813afe7f..1eb3c72c655e 100644
--- a/packages/devextreme-angular/src/ui/tag-box/index.ts
+++ b/packages/devextreme-angular/src/ui/tag-box/index.ts
@@ -1645,8 +1645,10 @@ export class DxTagBoxComponent extends DxComponent implements OnDestroy, Control
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiTagBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiTagBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiTagBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
     @ContentChildren(DxiTagBoxItemComponent)
@@ -1654,8 +1656,10 @@ export class DxTagBoxComponent extends DxComponent implements OnDestroy, Control
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiTagBoxItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiTagBoxItemComponent')) {
+            this.setContentChildren('items', value, 'DxiTagBoxItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -1665,7 +1669,8 @@ export class DxTagBoxComponent extends DxComponent implements OnDestroy, Control
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
@@ -1675,7 +1680,8 @@ export class DxTagBoxComponent extends DxComponent implements OnDestroy, Control
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/text-box/index.ts b/packages/devextreme-angular/src/ui/text-box/index.ts
index bf2abe7ff1e5..a014f83a5d49 100644
--- a/packages/devextreme-angular/src/ui/text-box/index.ts
+++ b/packages/devextreme-angular/src/ui/text-box/index.ts
@@ -1016,8 +1016,10 @@ export class DxTextBoxComponent extends DxComponent implements OnDestroy, Contro
         return this._getOption('buttons');
     }
     set buttonsChildren(value) {
-        this.setContentChildren('buttons', value, 'DxiTextBoxButtonComponent');
-        this.setChildren('buttons', value);
+        if (this.checkContentChildren('buttons', value, 'DxiTextBoxButtonComponent')) {
+            this.setContentChildren('buttons', value, 'DxiTextBoxButtonComponent');
+            this.setChildren('buttons', value);
+        }
     }
 
 
@@ -1027,7 +1029,8 @@ export class DxTextBoxComponent extends DxComponent implements OnDestroy, Contro
     }
     set buttonsLegacyChildren(value) {
         if (this.checkContentChildren('buttons', value, 'DxiButtonComponent')) {
-           this.setChildren('buttons', value);
+            this.setContentChildren('buttons', value, 'DxiButtonComponent');
+            this.setChildren('buttons', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/tile-view/index.ts b/packages/devextreme-angular/src/ui/tile-view/index.ts
index b910b5558da5..b47944570983 100644
--- a/packages/devextreme-angular/src/ui/tile-view/index.ts
+++ b/packages/devextreme-angular/src/ui/tile-view/index.ts
@@ -579,8 +579,10 @@ export class DxTileViewComponent<TItem = any, TKey = any> extends DxComponent im
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiTileViewItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiTileViewItemComponent')) {
+            this.setContentChildren('items', value, 'DxiTileViewItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -590,7 +592,8 @@ export class DxTileViewComponent<TItem = any, TKey = any> extends DxComponent im
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/toolbar/index.ts b/packages/devextreme-angular/src/ui/toolbar/index.ts
index 86537b50411a..269471f77b41 100644
--- a/packages/devextreme-angular/src/ui/toolbar/index.ts
+++ b/packages/devextreme-angular/src/ui/toolbar/index.ts
@@ -418,8 +418,10 @@ export class DxToolbarComponent<TItem = any, TKey = any> extends DxComponent imp
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiToolbarItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiToolbarItemComponent')) {
+            this.setContentChildren('items', value, 'DxiToolbarItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -429,7 +431,8 @@ export class DxToolbarComponent<TItem = any, TKey = any> extends DxComponent imp
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/tree-list/index.ts b/packages/devextreme-angular/src/ui/tree-list/index.ts
index c86e64430245..8e9dcc1482b7 100644
--- a/packages/devextreme-angular/src/ui/tree-list/index.ts
+++ b/packages/devextreme-angular/src/ui/tree-list/index.ts
@@ -2040,8 +2040,10 @@ export class DxTreeListComponent<TRowData = any, TKey = any> extends DxComponent
         return this._getOption('columns');
     }
     set columnsChildren(value) {
-        this.setContentChildren('columns', value, 'DxiTreeListColumnComponent');
-        this.setChildren('columns', value);
+        if (this.checkContentChildren('columns', value, 'DxiTreeListColumnComponent')) {
+            this.setContentChildren('columns', value, 'DxiTreeListColumnComponent');
+            this.setChildren('columns', value);
+        }
     }
 
 
@@ -2051,7 +2053,8 @@ export class DxTreeListComponent<TRowData = any, TKey = any> extends DxComponent
     }
     set columnsLegacyChildren(value) {
         if (this.checkContentChildren('columns', value, 'DxiColumnComponent')) {
-           this.setChildren('columns', value);
+            this.setContentChildren('columns', value, 'DxiColumnComponent');
+            this.setChildren('columns', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/tree-view/index.ts b/packages/devextreme-angular/src/ui/tree-view/index.ts
index f55cc0577a4f..c6a63ac8871e 100644
--- a/packages/devextreme-angular/src/ui/tree-view/index.ts
+++ b/packages/devextreme-angular/src/ui/tree-view/index.ts
@@ -1146,8 +1146,10 @@ export class DxTreeViewComponent<TKey = any> extends DxComponent implements OnDe
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiTreeViewItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiTreeViewItemComponent')) {
+            this.setContentChildren('items', value, 'DxiTreeViewItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -1157,7 +1159,8 @@ export class DxTreeViewComponent<TKey = any> extends DxComponent implements OnDe
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/validation-summary/index.ts b/packages/devextreme-angular/src/ui/validation-summary/index.ts
index b60e12402b7b..61679bbca695 100644
--- a/packages/devextreme-angular/src/ui/validation-summary/index.ts
+++ b/packages/devextreme-angular/src/ui/validation-summary/index.ts
@@ -212,8 +212,10 @@ export class DxValidationSummaryComponent<TItem = any, TKey = any> extends DxCom
         return this._getOption('items');
     }
     set itemsChildren(value) {
-        this.setContentChildren('items', value, 'DxiValidationSummaryItemComponent');
-        this.setChildren('items', value);
+        if (this.checkContentChildren('items', value, 'DxiValidationSummaryItemComponent')) {
+            this.setContentChildren('items', value, 'DxiValidationSummaryItemComponent');
+            this.setChildren('items', value);
+        }
     }
 
 
@@ -223,7 +225,8 @@ export class DxValidationSummaryComponent<TItem = any, TKey = any> extends DxCom
     }
     set itemsLegacyChildren(value) {
         if (this.checkContentChildren('items', value, 'DxiItemComponent')) {
-           this.setChildren('items', value);
+            this.setContentChildren('items', value, 'DxiItemComponent');
+            this.setChildren('items', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/validator/index.ts b/packages/devextreme-angular/src/ui/validator/index.ts
index e2a7c2a6f7db..2018c82e1f69 100644
--- a/packages/devextreme-angular/src/ui/validator/index.ts
+++ b/packages/devextreme-angular/src/ui/validator/index.ts
@@ -266,8 +266,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set asyncRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorAsyncRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorAsyncRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorAsyncRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorCompareRuleComponent)
@@ -275,8 +277,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set compareRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorCompareRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorCompareRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorCompareRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorCustomRuleComponent)
@@ -284,8 +288,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set customRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorCustomRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorCustomRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorCustomRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorEmailRuleComponent)
@@ -293,8 +299,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set emailRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorEmailRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorEmailRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorEmailRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorNumericRuleComponent)
@@ -302,8 +310,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set numericRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorNumericRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorNumericRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorNumericRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorPatternRuleComponent)
@@ -311,8 +321,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set patternRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorPatternRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorPatternRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorPatternRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorRangeRuleComponent)
@@ -320,8 +332,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set rangeRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorRangeRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorRangeRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorRangeRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorRequiredRuleComponent)
@@ -329,8 +343,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set requiredRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorRequiredRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorRequiredRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorRequiredRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorStringLengthRuleComponent)
@@ -338,8 +354,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set stringLengthRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorStringLengthRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorStringLengthRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorStringLengthRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
     @ContentChildren(DxiValidatorValidationRuleComponent)
@@ -347,8 +365,10 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
         return this._getOption('validationRules');
     }
     set validationRulesChildren(value) {
-        this.setContentChildren('validationRules', value, 'DxiValidatorValidationRuleComponent');
-        this.setChildren('validationRules', value);
+        if (this.checkContentChildren('validationRules', value, 'DxiValidatorValidationRuleComponent')) {
+            this.setContentChildren('validationRules', value, 'DxiValidatorValidationRuleComponent');
+            this.setChildren('validationRules', value);
+        }
     }
 
 
@@ -358,7 +378,8 @@ export class DxValidatorComponent extends DxComponentExtension implements OnDest
     }
     set validationRulesLegacyChildren(value) {
         if (this.checkContentChildren('validationRules', value, 'DxiValidationRuleComponent')) {
-           this.setChildren('validationRules', value);
+            this.setContentChildren('validationRules', value, 'DxiValidationRuleComponent');
+            this.setChildren('validationRules', value);
         }
     }
 
diff --git a/packages/devextreme-angular/src/ui/vector-map/index.ts b/packages/devextreme-angular/src/ui/vector-map/index.ts
index 2261d6215ba7..2d3f8a63ec55 100644
--- a/packages/devextreme-angular/src/ui/vector-map/index.ts
+++ b/packages/devextreme-angular/src/ui/vector-map/index.ts
@@ -777,8 +777,10 @@ export class DxVectorMapComponent extends DxComponent implements OnDestroy, OnCh
         return this._getOption('annotations');
     }
     set annotationsChildren(value) {
-        this.setContentChildren('annotations', value, 'DxiVectorMapAnnotationComponent');
-        this.setChildren('annotations', value);
+        if (this.checkContentChildren('annotations', value, 'DxiVectorMapAnnotationComponent')) {
+            this.setContentChildren('annotations', value, 'DxiVectorMapAnnotationComponent');
+            this.setChildren('annotations', value);
+        }
     }
 
     @ContentChildren(DxiVectorMapLayerComponent)
@@ -786,8 +788,10 @@ export class DxVectorMapComponent extends DxComponent implements OnDestroy, OnCh
         return this._getOption('layers');
     }
     set layersChildren(value) {
-        this.setContentChildren('layers', value, 'DxiVectorMapLayerComponent');
-        this.setChildren('layers', value);
+        if (this.checkContentChildren('layers', value, 'DxiVectorMapLayerComponent')) {
+            this.setContentChildren('layers', value, 'DxiVectorMapLayerComponent');
+            this.setChildren('layers', value);
+        }
     }
 
     @ContentChildren(DxiVectorMapLegendComponent)
@@ -795,8 +799,10 @@ export class DxVectorMapComponent extends DxComponent implements OnDestroy, OnCh
         return this._getOption('legends');
     }
     set legendsChildren(value) {
-        this.setContentChildren('legends', value, 'DxiVectorMapLegendComponent');
-        this.setChildren('legends', value);
+        if (this.checkContentChildren('legends', value, 'DxiVectorMapLegendComponent')) {
+            this.setContentChildren('legends', value, 'DxiVectorMapLegendComponent');
+            this.setChildren('legends', value);
+        }
     }
 
 
@@ -806,7 +812,8 @@ export class DxVectorMapComponent extends DxComponent implements OnDestroy, OnCh
     }
     set annotationsLegacyChildren(value) {
         if (this.checkContentChildren('annotations', value, 'DxiAnnotationComponent')) {
-           this.setChildren('annotations', value);
+            this.setContentChildren('annotations', value, 'DxiAnnotationComponent');
+            this.setChildren('annotations', value);
         }
     }
 
@@ -816,7 +823,8 @@ export class DxVectorMapComponent extends DxComponent implements OnDestroy, OnCh
     }
     set layersLegacyChildren(value) {
         if (this.checkContentChildren('layers', value, 'DxiLayerComponent')) {
-           this.setChildren('layers', value);
+            this.setContentChildren('layers', value, 'DxiLayerComponent');
+            this.setChildren('layers', value);
         }
     }
 
@@ -826,7 +834,8 @@ export class DxVectorMapComponent extends DxComponent implements OnDestroy, OnCh
     }
     set legendsLegacyChildren(value) {
         if (this.checkContentChildren('legends', value, 'DxiLegendComponent')) {
-           this.setChildren('legends', value);
+            this.setContentChildren('legends', value, 'DxiLegendComponent');
+            this.setChildren('legends', value);
         }
     }