>Thanks for the suggestion. What/where is the ASSIGN event?

When yo add the property MyProperty in VFP 6 you can check the checkboxes to have MyProperty_Access and MyProperty_Assign methods which will fire accordingly each time the property is accessed (it's value is read) or changed.
In this case you may probably use RowSourceType - 2 Alias (provided it already exists) and rerun your SP only when necessary (something changes). You will still need to REQUERY the combo.

>I just tried putting the sp in the rowsource property and that seems to work. So, if I need to call it at any other time, then a REQUERY of the combo should work, right?

Yes, that's right. In this case it will both re-execute the query and repopulate the list.

Nick