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TreeView Sync to SelectedItem in View Model

I have a ViewModel on top of a WPF TreeView control. I want the ViewModel to be able to set and read the SelectedItem from the TreeView. However, the SelectedItem property of the TreeView is not bindable.

I am able to set and get the selected item in the code behind (using the ItemContainerGenerator and TreeViewItem.IsSelected = true) but this leads to some ugly communication between the code behind and the ViewModel.

Does anyone have a clean solution for this?

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