RibbonSplitButton Dropdown Content access

[Tenjim]

Hi there,

Is it possible to put an UserControl into DropDown content to a RibbonSplitButton ?
Like this sample :

<RibbonSplitButton 
	   ToolTip.Tip="{Binding TestViewModel}"
	   Content="{Binding TestViewModel.Label}"
	   Command="{Binding Path=Command}"
	   MaxSize="Large"
	   MinSize="Large">

	<input1:CustomUserControl DataContext="{Binding TestViewModel.TestItemViewModel}"/>
</RibbonSplitButton>

I tried with RibbonDropDownButton and I have the same behavior.

Thank in advance