>Everynow and again when I show a form with this control on, I get the following message: Invalid Dynamic Forecolor, in a messagebox with a single OK button, clicking on this then gives me the Invalid Dynamic Backcolor, this happens for every column in the Grid, can anybody could give me any idea to stop this from happening.

Simon,
Put a valid expression that's returning an integer.
Remember in Dynamic* "this" refers to grid itself.
Cetin