Add the BindingContext property to the Window TitleBar and inherit its value from the Window's BindingContext

[egvijayanand]

Description

Adding a BindingContext property to the Window TitleBar is essential, as it facilitates the binding of properties and commands of the controls hosted within it to a ViewModel instance.

Public API Changes

Add the BindingContext property to the Window TitleBar and inherit its value from the Window's BindingContext.

Intended Use-Case

To manage the properties and commands of the controls hosted within the Window TitleBar from the ViewModel.

[egvijayanand]

I'm trying to bind the SearchBar, hosted in the TitleBar, to a property and command in the ViewModel.

[Foda]

Hello! The TitleBar in .NET 9 of MAUI supports this. You can see an example of the BindingContext (and the Window titlebar) being set here:
https://github.com/dotnet/maui/blob/net9.0/src/Controls/samples/Controls.Sample/Pages/PlatformSpecifics/Windows/WindowsTileBarPage.xaml.cs#L21C1-L38C4

[egvijayanand]

Still the BindingContext is set separately for the TitleBar. Is that the recommended approach?

I've defined the TitleBar in XAML as part of the Window definition. I'm assigning the Window BindingContext, which is not passed on to the TitleBar. The child control is supposed to inherit the parent's BindingContext.

Will upload and share the sample by tomorrow.