Hierarchical Menu's

[Dave]

Hi,

It is possible to have a Combo Box or (or Popup menu on Mac) with  
Hierarchical Menu's in it?

If so, how do I dynamically create a Submenu? I have a list of users:

Fred
George
Harry

And each user can select a number of different Items, e.g.

		Item1
Fred>	Item2
		Item3

           	   Item1
George >  Item2
		   Item3


I can't seem to find a way of doing this in a combo box, only a pull  
down which has to be in a menu bar???

If I can't do what I want with a Combo/PopUp and suggestion on how to  
do it would be greatly appreciated.

Thanks a Lot
All the Best
Dave