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in your drag drop handler, get the dragged row(s), use the getItemIndex() method of the underlying dataProvider array collection to see if this row is already there, if so, just call the event.preventDefault() and set the feedback to stop.
Thanks, this should work.
One problem. I'm getting an error "1120: Access of undefined property DM." for the following line:
you should use DragManager.NONE
Thanks guys, that worked great!