Cursor location reflect to control

Hi,

I always get the position of cursor reflect to rendered cell is always beyond the control

This code below is run when cell is activated.
my snippet code :

Control control = grid.CurrentCell.Renderer.Control;
if (control != null){
Point point = control.PointToClient(Cursor.Position);
}

The content of the variable point is always out of the area of the control. can u give me any suggestion to get the correct position of the cursor reflect to control.

Thanks in advance,
Wirawan