Could you please elaborate more on your scenario so that we could advice you better? Having RadTreeView in the ItemTemplate of another RadTreeView is bad practice that could lead to various problems. Actually, this way you are defining RadTreeView in RadTreeViewItem. Isn't it possible to just use one RadtreeView with different templates for the different HierarChical levels if needed ? Probably, the behavior that you want could be achieved with custom D'N'D events of the RadDragAndDropManager but it could cost a lot of code.
Thank you for your cooperation.
the Telerik team
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