protected override void WndProc(ref Message m) {
        if (m.Msg == 0x20) {  // Trap WM_SETCUROR
            if ((m.LParam.ToInt32() & 0xffff) == 2) { // Trap HTCAPTION
                Cursor.Current = Cursors.Hand;
                m.Result = (IntPtr)1;  // Processed
                return;
            }
        }
        base.WndProc(ref m);
    }