class CMainDlg : public CDialogImpl<CMainDlg>
    {
    public:
        enum { IDD = IDD_MAINDLG };

        BEGIN_MSG_MAP(CMainDlg)
            MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
            MESSAGE_HANDLER(WM_LBUTTONDOWN, OnButton)
            COMMAND_CODE_HANDLER(0,OnMenu)
            COMMAND_ID_HANDLER(ID_APP_ABOUT, OnAppAbout)
            COMMAND_ID_HANDLER(IDOK, OnOK)
            COMMAND_ID_HANDLER(IDCANCEL, OnCancel)
        END_MSG_MAP()

        LRESULT OnMenu(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL& bHandled)
        {
            // 如果是按钮消息
            if(!!hWndCtl){
                bHandled = FALSE;
                return TRUE;
            }
            switch(wID){
            case 1:
                return 0;
            }
            return 0;
        }
        LRESULT OnButton(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& /*bHandled*/)
        {
            CMenu menu;
            menu.CreatePopupMenu();
            menu.AppendMenu(MF_STRING,1,_T("菜单项1"));
            menu.AppendMenu(MF_SEPARATOR);
            menu.AppendMenu(MF_STRING,2,_T("菜单项2"));
            // 特定位置插入
            menu.InsertMenu(1,MF_BYPOSITION|MF_STRING,3,_T("菜单项3"));
            // 删掉第一个菜单
            menu.DeleteMenu(0,MF_BYPOSITION);

            // 添加子菜单
            menu.AppendMenu(MF_BYPOSITION|MF_POPUP|MF_STRING,
                  m_sysmenu_,_T("子菜单"));

            CPoint pt_;
            ::GetCursorPos(&pt_);
            menu.TrackPopupMenu(TPM_LEFTALIGN, pt_.x,pt_.y,m_hWnd);

            // 注意移除（不要删除）系统菜单，否则下次会失败
            menu.RemoveMenu(3,MF_BYPOSITION);

            return 0;
        }
        LRESULT OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
        {
            m_sysmenu_.Attach(::GetSystemMenu(m_hWnd,FALSE));
            /*
            All predefined window menu items have identifier numbers 
            greater than 0xF000. If an application adds commands 
            to the window menu, it should use identifier numbers less than 0xF000.
            */
            m_sysmenu_.AppendMenu(MF_STRING,1233,_T("子菜单项"));
            return TRUE;
        }

        CMenuHandle m_sysmenu_;
    };

    An application can call this function in the following way.
    FindWindowEx( NULL, NULL, MAKEINTATOM(0x8000), NULL );
    Note that 0x8000 is the atom for a menu class. When an application calls this function, 
    the function checks whether a context menu is being displayed that the application created.