VS2013MFC怎么在原有对话框下加菜单

Question

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
BOOL bNameValid;
CString strAboutMenu;
bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
ASSERT(bNameValid);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

找到的代码如下，看不太懂，可以解释一下吗
而且运行不报错，但没有对话框不显示菜单

Answer 1

http://blog.csdn.net/phenixyf/article/details/42712441