WPF TreeView - selecting and expanding nodes?

You shouldn't put a TreeViewItem in your DataTemplate . The TreeViewItem is created automatically by the TreeView . The DataTemplate defines the content of the TreeViewItem not the TreeViewItem itself.

Now you have two nested TreeViewItems which is probably why it doesn't work as expected. Try that instead.

Try TreeViewItem. Selected Event instead of the TreeView. SelectedItemChanged.

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