>What I wanted to say by hover is the current row data for that column must be visible in editbox the rest all in rows as normal.

As Frank says, if you're using an Activex grid, maybe that grid has the ability to expand current row only? You could make the current row high enough; the problem would be to detect what is big enough - if you could know when is your editbox showing a scrollbar, and expand until it vanishes, that would do it. When the mouse leaves the row, you could revert to regular height.

If your grid is not capable of this, see my reply to Frank - the other thoughts I had about this problem are there.