>>VFP convert every List's item into the SET("NULLDISPLAY") string,
>>and put the selected list's item into the controlsource
>>( with VAL() conversion for an numeric source )
>>
>>NULL is not usable
>
>What are you saying? There is no workaround for the problem?

A class's workaround,for every rowsourcetype, is very difficult.

A object's workaround is simple, but I don't consider it