>Not really. When the user chooses add the combobox's value is blank. I want the user to choose one of the three choice available from the dropdown list. However, the dropdown list contains the three choices I have specified plus a fourth choice which is blank. I want to know how to prevent that blank choice from being in the dropdown.

When the user will add, you may detect that event and put a default value which is one of those 3. What happens now is that the default value is blank and VFP can't find a match to preselect an item from the list. This is why it is blank.