Fix this flickering behaviour of old Win32 controls. The code is based on a discussion on StackOverflow http://stackoverflow.com/questions/487661/how-do-i-suspend-painting-for-a-control-and-its-children

RedrawSuspender.cs

public static class ControlExtensions
{
    public static IDisposable GetRedrawSuspender(this Control cuntrol) { return new RedrawSuspender(cuntrol); }
}

public class RedrawSuspender : IDisposable
{
    private Control _control;

    internal RedrawSuspender(Control control)
    {
        if (control == null) return;
        _control = control;
        SuspendRedraw();
    }

    void IDisposable.Dispose()
    {
        if (_control == null) return;
        ResumeRedraw();
        _control = null;
    }

    private void SuspendRedraw()
    {
        if (_control == null) return;
        var m = Message.Create(_control.Handle, WindowMessage.SetRedraw, IntPtr.Zero, IntPtr.Zero);
        var window = NativeWindow.FromHandle(_control.Handle);
        window.DefWndProc(ref m);
    }

    private void ResumeRedraw()
    {
        if (_control == null) return;
        var wparam = new IntPtr(1);
        var msgResumeUpdate = Message.Create(_control.Handle, WindowMessage.SetRedraw, wparam, IntPtr.Zero);
        var window = NativeWindow.FromHandle(_control.Handle);
        window.DefWndProc(ref msgResumeUpdate);
        _control.Invalidate();
    }
}