>I had the code below originally using table buffering but then modified it test row buffering as well.

We found the reason for this behavior. That particular textbox has Valid event which fires even if the textbox is in read-only mode. So, we had to put some logic to save current value in GotFocus event and fire validation only if the change was made.

The problem is that we have similar textbox in few places on the form, so we have to fix all these controls. Not a big problem, though.

Thanks again for your help.