I definitely don't.
The only time I ever change the cell is here:
if (this.Selected && cols.CurrentColumn == info.col)
{
using (Pen pen = new Pen(Color.Yellow, 1))
{
Rectangle cell = info.cellRect;
if ((info.grid.FlyGrid.Options & GridOptions.ShowHorzLines) != 0)
{
cell.Height -= info.grid.FlyGrid.LineWidth;
}
if ((info.grid.FlyGrid.Options & GridOptions.ShowVertLines) != 0)
{
cell.Width -= info.grid.FlyGrid.LineWidth;
}
info.g.DrawRectangle(pen, cell);
}
}