TDBLooukUpComboBox & IB

Hi all,

I experimented an incredible malfunction with the TDBLookUpComboBox working
in IB 5.x.
The same occurs in IB 6.
When we select one value of the drop down list of Combo, after SQL process,
the edit part of Combo Box, shows always the first value of the list, and
not the selected.
In Access 97, the  same Data Base and the same form, works properly.
Any help?

Thanks.