>I was thinking of something simpler - an editbox which would be over (as in zOrder) the grid, but invisible, until the mouse hits the control in the grid. Since there's the word "hover" in the caption of the thread, I figure it would be in the control's MouseEnter - make editbox visible, give it focus; when it loses focus, make editbox invisible, refresh the control in the grid. The control itself, IMO, would probably be a textbox, showing the first line of the memo.

Yes exactely that's what I meant. However in case he uses an ActiveX-Grid the solution with the form is the only way to make it. Wit a normal VFP-Grid an editbox hidden on the form will do.