refresh drop zones for UI Draggable/Droppable

refresh drop zones for UI Draggable/Droppable


I'm writing an application that allows users to drag items from a list
and drop them into one of several "bins". I got this working just fine
using UI Draggable/Droppable.
Now I'm trying to enhance the application. When the user drags an item
to one of the bins and hovers ( using "over"), I open up a new panel
with several "sub bins" that they can also drop the item into (i.e. to
further classify the item if they wish).
I tried to accomplish this by simply making the same call to droppable
on the new sub bins, but that doesn't work. I realize now that the
drop zones are calculated when the drag begins. I tried setting the
refreshPositions:true option, but the performance is too poor for what
I need. Instead, I wondered if there was a way to programmatically
force a refreshPositions calculation once the new panel is in place? I
haven't found a way to do so, and was hoping someone would have a
suggestion.
The closest I've found to a possible solution via Google is this
http://bit.ly/ZbfQC but I'm not sure I understand what they're
suggesting there.
thanks,
David