>Barbara and Pete:
>What is the ControlSource?:
> The controlsource on the column control is a field from a table.
>
>Have you got any controls other than the standard textbox in your columns?:
> No, I use the
>
>
> Any code in the base classess of the controls?:
> Yes, and this was causing the problem.
>
>Thanks you very much for your help.
>Sergio.

Sergio,
glad you got it sorted
Regards
Pete Kane