Thank you for the inquiry.
Although RadToolStripItems do not have the dragdrop events, you can still implement the drag'n'drop scenario using the events of RadTreeView. I have demonstrated the approach in the sample project attached. The events that you need are RadTreeView's DragStarted and DragEnded. Just check where the mouse cursor is when the drag operation is ended, and depending on the place, do the necessary operations.
If you have additional questions, feel free to contact me.
the Telerik team
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