给datagridview最左边一列加上“序号”的列名后，运行时鼠标放到上面就不显示了，鼠标拿开就又显示了。这是怎么回事啊??
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我的代码是这样的SolidBrush solidBrush;
            solidBrush = new SolidBrush(dgv销售出库单表.RowHeadersDefaultCellStyle.ForeColor);
            if (e.ColumnIndex == -1)
                e.Graphics.DrawString("序号", this.dgv销售出库单表.Font, solidBrush, 5, 5);