RadContextMenu has a really useful method called GetClickedElement<T>() that returns the item that is being clicked.
sender, RoutedEventArgs e)
RadContextMenu menu = sender
RadTreeViewItem clickedItem = menu.GetClickedElement<RadTreeViewItem>();
I've attached a sample project demonstrating this functionality. Give it a try and let me know how it works for you.
All the best,
the Telerik team
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