如何触发轨迹栏的OnValueChanged事件

问题描述

我绘制了trackbar组件并将其命名为cumstomtrackbar，它继承自trackbar类。

但我发现customtrackbar无法触发OnValueChanged事件，如何触发它？

一些相关的代码如下：

I drawed trackbar component and named it as cumstomtrackbar,it inherit from trackbar class.
But I find that the customtrackbar can't tigger OnValueChanged event,how to trigger it ?
some releated code as below:

  public class CustomTrackBar:System.Windows.Forms.TrackBar
 {
        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM.WM_PAINT:
                    if (true)
                    {
                        PAINTSTRUCT ps = new PAINTSTRUCT();
                        BeginPaint(m.HWnd, ref ps);
                        DrawTrackBar(m.HWnd);
                        ValidateRect(m.HWnd, ref ps.rcPaint);
                        EndPaint(m.HWnd, ref ps);
                    }
                    else
                    {
                        base.WndProc(ref m);
                    }
                    break;
                default:
                    base.WndProc(ref m);
                    break;
            }
        }
}

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