>You mean using the replace command?

Yes.

I suggested doing a full grid refresh and because you are calling the form's Save method (in your sample code), this actually calls a RefreshAll in the Codemine framework so you end up getting the grid refresh along the way. However, the RefreshAll method (called by your form.Save) updates/refreshes a load of other stuff that again may cause too much overhead. You can save on the individual cursor by just calling its Update method (or via the DM). Then, by just refreshing the grid only, it should be quicker.

I was actually suggesting that you replace this :-

THIS.PARENT.PARENT.COLumn4.CHkcheckboxcustom1.SetValue(1)

with a data-replace to its Control source, "Update" the cursor (if you want), and then refresh the grid. If the grid source is buffered, you can discard the changes or as you said, its easy enough to reset it anyhow, even if the changes are committed right away.

Either way, you are on the right track now.

Best