My application currently has 2 comboboxes on the main form. The first combobox has 14 items, but 5 categories. I would like to list the categories in an additional combobox that I would place on the form above the 14 item combobox. Then populate dynamically the original 14 item combobox (doing a clear()) first) with items based on the category combox selection. I think I've found how to clear and add items, but I don't know how to connect the signal. Any help would be greatly appreciated. Thanks.