[AccessD] Setting controls to null (AXP)

Hi again everyone

I have a combo box containing staff records, bound on ID field. I want to
display all the records even though some of them will be invalid choices,
and display an error message giving a reason if the user tries to make an
invalid selection and offereing to take certain actions, blah blah. 

If the user chooses to cancel rather than proceed, I need to then set the
combo box back to null. I can't set it to a 0 or a zero length string, it
HAS to be a null. How???

Hope someone has the key

Roz


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