[MFC] Show/Hide Menubar

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
      if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
            return -1;
   
      if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP
            | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
            !m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
      {
            TRACE0("Failed to create toolbar\n");
            return -1;      // fail to create
      }

      if (!m_wndStatusBar.Create(this) ||
            !m_wndStatusBar.SetIndicators(indicators,
              sizeof(indicators)/sizeof(UINT)))
      {
            TRACE0("Failed to create status bar\n");
            return -1;      // fail to create
      }

      // TODO: Delete these three lines if you don't want the toolbar to
      //  be dockable
      m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
      EnableDocking(CBRS_ALIGN_ANY);
      DockControlBar(&m_wndToolBar);

      // OrgMenu is defined in the member variable of CMainFrame
      // Load menu on create
      OrgMenu.LoadMenu(IDR_MAINFRAME);
      return 0;
}

void CMainFrame::OnHide()
{
      // hide menu
      SetMenu(NULL);
}

void CMainFrame::OnShow()
{
      // show menu
      SetMenu(&OrgMenu);
}