I am using a ComboBox with the Style property set to 2-DropDown List and the RowSourceType property set to 1 (Value)

The three choices that I set in the RowSource are appearing correctly in the Dropdown list except that it is a blank fourth choice added to it. Probably beacause it is a ComboBox class. But, since I do not want the user to do a blank entry in that field how can I set the DropDown that the blank line will not be available ?