Hi C# Experts:

I'm writing a C# MDI program. I need to know when user is moving mouse on
MDI's non-client area (that dark-gray background). I have tried code below
but it did not catch the user's action. Anyone knows how it should be done?

Thanks in advance.
Polaris

protected override void WndProc (ref Message m)
{
           if (m.Msg == Utils.WM_NCMOUSEMOVE)
                 Utils.Beep(11000, 20);

           base.WndProc(ref m);
}