>>I want to display a multi line control (edit box) for the one column in the grid. The column value for current row has to be shown in a 3-4 line editbox.
>>If I put the edit box in grid all the rows height have to be increased.
>>
>>I want to make the control to hover over over grid and behave as normal while editing is done.
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>How about a form that has no borders, titles but only the edit. This gets called and positioned when the mouse is over the Control

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.