How to extend the painting of a trackbar control

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C#

.NET

C#4.0

C#3.5

Hi all,

This is driving me nuts. I am trying to label the ticks of a trackbar control. Therefore I want the control to use its base paint implementation, so I can add paint code to draw labels underneath every trackbar tick. I found an example that does basically the same thing. TimeSlider - A time-based TrackBar[^]

What I do is the following :

public class DateTimeTrackBar : TrackBar
{
   :
   public DateTimeTrackBar()
   {
      :
      SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint |      ControlStyles.ResizeRedraw, true);
   }

   protected override void OnPaint(PaintEventArgs e)
   {
      base.OnPaint(e);

      base.SetStyle(ControlStyles.UserPaint, false);

      base.Refresh();                      // Use default paint implementation.

      // Adding additional paint code.
      if (ShowLabels)
         DrawLabels(e);                    // Works fine.

      base.SetStyle(ControlStyles.UserPaint, true);
   }
}

When the control comes up everything seems ok, but when I touches the trackbar thumb the control repaints itself and my labeling disappears. How is this possible ?

tia