protected virtual void TrackBarDrawVerticalThumbLeft (Graphics dc, Rectangle thumb_pos, Brush br_thumb, Rectangle clippingArea, TrackBar trackBar)
{
Pen pen = SystemPens.ControlLightLight;
dc.DrawLine (pen, thumb_pos.X + 4, thumb_pos.Y, thumb_pos.X + 4 + 16, thumb_pos.Y);
dc.DrawLine (pen, thumb_pos.X + 4, thumb_pos.Y, thumb_pos.X, thumb_pos.Y + 4);
pen = SystemPens.ControlDark;
dc.DrawLine (pen, thumb_pos.X + 4, thumb_pos.Y + 9, thumb_pos.X + 4 + 16, thumb_pos.Y + 9);
dc.DrawLine (pen, thumb_pos.X + 4, thumb_pos.Y + 9, thumb_pos.X, thumb_pos.Y + 5);
dc.DrawLine (pen, thumb_pos.X + 19, thumb_pos.Y + 9, thumb_pos.X + 19, thumb_pos.Y + 1);
pen = SystemPens.ControlDarkDark;
dc.DrawLine (pen, thumb_pos.X + 4, thumb_pos.Y + 10, thumb_pos.X + 4 + 16, thumb_pos.Y + 10);
dc.DrawLine (pen, thumb_pos.X + 4, thumb_pos.Y + 10, thumb_pos.X - 1, thumb_pos.Y + 5);
dc.DrawLine (pen, thumb_pos.X + 20, thumb_pos.Y, thumb_pos.X + 20, thumb_pos.Y + 10);
dc.FillRectangle (br_thumb, thumb_pos.X + 4, thumb_pos.Y + 1, 15, 8);
dc.FillRectangle (br_thumb, thumb_pos.X + 3, thumb_pos.Y + 2, 1, 6);
dc.FillRectangle (br_thumb, thumb_pos.X + 2, thumb_pos.Y + 3, 1, 4);
dc.FillRectangle (br_thumb, thumb_pos.X + 1, thumb_pos.Y + 4, 1, 2);
}
