Unfortunately at the moment there's no straightforward way to swap the items in minimized state by dragging (you can swap them on button click, but I guess this is not what you're looking for ?). If you want to create such functionality you'll have to play around with the DragDropManager and add some code behind.
I've created and attached a sample project which shows how you can do this so could you please examine it and see if this is what you're looking for?
If you have more questions feel free to ask.
the Telerik team
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