We have a combobox class like that built into Visual FoxExpress. Ours is pretty tightly tied into DBCX and some other pieces of the framework, so posting the code wouldn't be much help, but Tamar Granor did a session at the Southwestern Regional FoxPro Developers Conference last year on "QuickFill" comboboxes, which would be exactly what you're looking for. I think you can download last years notes from MESLLC.COM.