I do use my own sub-class of a combo, but there is nothing special about it.

>Thanks Mark
>
>I forgot to mention this problem is in VFP 6.00, just in case that makes a difference. I am using it as a dropdown list.
>
>Are you using your own class for this by any chance, this could explain why you never have a problem with them.
>
>Doing a search on "grid combobox" seems to indicate a lot of folks are struggling to use combos in a grid.
>
>I have this working now as per the example using a field statement on a normal table, but I had to use a replace command in the valid of the combo to update the underlying table.
>
>I have had a miserable time getting things to work as I want, this always happens to me when using combos in grids.