I can suggest an example that shows how to create RadDock objects by having the initial drag come from a RadTreeView control. This example creates the dock controls on the server-side and adds them to the specific zone. You can find it attached to this post. It could be possible to achieve the same effect with GridView if you incorporate draggable object in the control.
I hope that you will successfully implement the desired functionality, given the information above.
the Telerik team
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