I've set ControlSource to the same field as RowSource and it work now. After all these years working with VFP, I'm still confused about the properties of the combobox. Why do we need 2 properties to set the source of a combobox (ControlSource and RowSource)? Why not just one? What's the difference between ControlSource and RowSource?

>You need to have ControlSource set to the field in order for this to work. It can not be the same field as in RowSource, should be from a different table, I think.