>Hi John,
>
>I believe the when event only fires when the control is enabled. Therefore it seems to me that you could leave the control enabled all the time and use the when event itself to control access to the control.
>
>eg. When Event code
>
>RETURN Grid1.otherfield.Value
>
>Where otherfield.Value = .T. or .F.

Thanks Ray,
I looked at that 'return' and just thought this will never work. I have never used the return this way but of course it did. Now it makes sense.
Thanks for your help.
John