private void OnSetCellFormat(DataGridFormatCellEventArgs e)
        {
            FormatCellEventHandler handler = SetCellFormat;

            if (handler != null)
            {
                handler(this, e);
            }
        }
        protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, Brush backBrush, Brush foreBrush, bool alignToRight)
        {
            DataGridFormatCellEventArgs e = new DataGridFormatCellEventArgs(rowNum, source);

            e.ForeBrush = foreBrush;
            e.BackBrush = backBrush;
            OnSetCellFormat(e);
            base.Paint(g, bounds, source, rowNum, e.BackBrush, e.ForeBrush, alignToRight);
        }