Sorry to bother you guys again, but I never found an answer for my strange droppable region problem.
The situation is that I have Boxes that respond to dragOver and dragDrop messages. However, the dragOver message doesn't get fired over the whole object. The area that generates a dragOver message seems to change based on how many children are added to the box. However, even that seems to be inconsistent. Noting in the source that the dragOver event seems to be called within the mouseOver event for dragProxy, I tested the theory by putting a listener on mouseOver, which displayed the same problem. So, what defines a valid region for a mouseOver event?