InvalidCastException to IDock

[Andreysht]

Version: 11.1.0.1
App: DockMvvmSample

<Style Selector="ItemsControl > ContentPresenter"> applied to all matching children items in a tree. Not all of them are IDock.
This causes exceptions and binding errors listed below in DockMvvmSample application:

[Binding]An error occurred binding 'Proportion' to 'Proportion' at 'Proportion': 'Could not find a matching property accessor for 'Proportion' on 'Dock.Model.Mvvm.Controls.ProportionalDockSplitter'.' (ContentPresenter #45182569)
Exception thrown: 'System.InvalidCastException' in Dock.Avalonia.dll
[Binding]An error occurred binding '(unknown)' to 'IsCollapsable' at 'IsCollapsable': 'Unable to cast object of type 'Dock.Model.Mvvm.Controls.ProportionalDockSplitter' to type 'Dock.Model.Core.IDock'.' (ContentPresenter #45182569)
Exception thrown: 'System.InvalidCastException' in Dock.Avalonia.dll
[Binding]An error occurred binding '(unknown)' to 'IsEmpty' at 'IsEmpty': 'Unable to cast object of type 'Dock.Model.Mvvm.Controls.ProportionalDockSplitter' to type 'Dock.Model.Core.IDock'.' (ContentPresenter #45182569)

It could be fixed by adding name to the selector:

<Style Selector="ItemsControl#ProportionalDockControlItemsControl > ContentPresenter">

[wieslawsoltes]

Fixed on master