This is a known bug of the RadTreeView and it has already been fixed. However , the demo still needs to be remade, so I updated your Telerik points accordingly.
I modified the demo project for you in order to work properly. The key thing is the use of the RadTreeViewItem`s
instead of the propery IsInEditMode.
Please note that I am using the latest internal build control versions ( 1029 ).
Feel free ask if you need further help. I would be glad if I can assist you.
All the best,
the Telerik team
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