>>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.
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>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.

Mmm... yes, the form should be visible, but I'm thinking of focus. If you show the form, it will gain focus (unless you hide it in form's MouseLeave), but then it'd be a matter of navigation - where would the mouse pointer be once it leaves the form? It could create erratic navigation. Maybe if there was a read-only textbox somewhere on top, which would expand, just like it happens in Excel when you click on a cell which has several rows of text.

Another way would be to have a multiline tooltip (another Activex?), and use the form when clicked for editing.

Really an intriguing problem.