ItemSource in Tree View MVVM Style… I can't get it to bind properly?

First of all you set DataContext of the "LayourRoot" grid to a resource with key "Topics" which does not exist. That probably should be the "ViewModel" resource. Second of all, why can't you use the ItemsSource property on the TreeView?

Setting DataContext property on the TreeView alone will not work. Here is the correct XAML.

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