求指导，关于窗体中控件具有窗体标题栏同样功能的做法（最大、最小、移动窗体）

        protected override void WndProc(ref Message m)

        {

            base.WndProc(ref m);

            switch (m.Msg)

            {

                case Win32Methods.WM_NCHITTEST:

                    if ((int)m.Result == Win32Methods.HTCLIENT)

                    {

                        Point pt = new Point((int)m.LParam);

                        pt = PointToClient(pt);

                        Control control = GetChildAtPoint(pt);

                        if (control is Panel)

                        {

                            m.Result = (IntPtr)Win32Methods.HTCAPTION;

                        }

                    }

                    break;

            }

        }