> I'd need to do the exact same thing as you, so if you come up with a
> "better" (meaning more intuitive for the end-user) solution, I'd appreciate
> if you posted it.

What I've seen done (I don't use data aware components myself) is the placing of a checkbox alongside the combobox, that when unchecked would disable the combobox so the query builder procedure wouls see this as null.

--
Best regards,
Carlos mailto:eustaquio.tre@...

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