帮忙看下这段代码

我想添加一个菜单  有一个mseeagebox 但是我的对话框弹不出 帮忙看下
void CRascalView: OnRButtonDown(UINT nFlags, CPoint point)
{
CMenu *pMenu=AfxGetMainWnd()->GetMenu();
pMenu->GetSubMenu(0) ->AppendMenu(MF_SEPARATOR);
pMenu->GetSubMenu(0) ->AppendMenu(MF_STRING,ID_Machine,"设备");
MessageBox("error",MB_OK);
CView: OnRButtonDown(nFlags, point);
}