重绘groupbox 边框 title

private void group_Filter_Paint(object sender, PaintEventArgs e)        {            e.Graphics.Clear(group_Filter.BackColor);            Color color = Color.Red;            Pen Pen_AL = new Pen(color, 3);            e.Graphics.DrawString(group_Filter.Text, group_Filter.Font, Brushes.Blue, 10, 1);            e.Graphics.DrawLine(Pen_AL, 1, 7, 8, 7);            e.Graphics.DrawLine(Pen_AL, e.Graphics.MeasureString(group_Filter.Text, group_Filter.Font).Width + 8, 7, group_Filter.Width - 2, 7);            e.Graphics.DrawLine(Pen_AL, 1, 7, 1, group_Filter.Height - 2);            e.Graphics.DrawLine(Pen_AL, 1, group_Filter.Height - 2, group_Filter.Width - 2, group_Filter.Height - 2);            e.Graphics.DrawLine(Pen_AL, group_Filter.Width - 2, 7, group_Filter.Width - 2, group_Filter.Height - 2);                      }