I'm having trouble setting the ControlSource property of a combobox on a UserForm. I've created an add-in that includes the UserForm and a "Config" worksheet that I'm using to store some lookups. I'd like to set the controlsource property of the combobox to a range on the Config sheet. I've given the range a name, but when I reference that name in the ControlSource property, I get an error "Invalid property value". Should I be more explicit with my reference (workbook, worksheet, etc.) and if so, what's the syntax? I've tried in vain to RTFM. Any help is appreciated.