static extern bool ModifyMenu(IntPtr hMnu, uint uPosition, uint uFlags,

       ModifyMenu(hmenusys, close, 0X0, (IntPtr) min, "Close");

       ModifyMenu(hmenusys, max, 0X0, (IntPtr)close, "Maximize");

       ModifyMenu(hmenusys, min, 0X0, (IntPtr)max, "Minimize");