I've noticed that it is easier to drag and drop docked element on top of another element, as supposed to on the bottom of that element. Is it possible that you guys can make the top and bottom drop zones equally sensitive? Take a look at the igoogle example with their drag panels, it is easy to drag and drop regardless http://www.google.com/ig
. With the RAD controls, to drop on the bottom takes several tries.
Please look into it.