Will,

>>We have lots of forms with two or more combo boxes above each other.

>>The problem I am having is that every so often when I click on a selection from the first combo, it selects (no problem), but then the combo directly under the mouse also drops down.

You may want to try testing for the position of the mouse relative to the combo with something like:

* METHOD: DropDown
LOCAL ARRAY laMouse[1]

AMOUSEOBJ(laMouse)

IF THIS = laMouse[1]
   *** the mouse is really over this combo
   *** do your DropDown stuff
ENDIF

Regards,
Thom C.