Excel VBA中的组合框中的不可选项

I have a combo box (in a user form in Excel) whose data source is set of menu items with headers (a named range in a worksheet). Right now, my workaround is to erase these headers (e.g. Main Course, Desserts, Beverages, etc.) but I would still like to know if it's possible to add these unselectable headers so that the end user has distinctions between the different menu items. Any help would be very much appreciated :)I have a combo box (in a user form in Excel) wh