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m_pMenu = GetSystemMenu(FALSE);
m_pMenu->EnableMenuItem(1 , MF_BYPOSITION | MF_GRAYED | MF_DISABLED) ;
void CXxxDlg::OnInitMenuPopup(CMenu* pPopupMenu, UINT nIndex, BOOL bSysMenu)
{
CDialog::OnInitMenuPopup(pPopupMenu, nIndex, bSysMenu);
if (bSysMenu)
{
pPopupMenu->EnableMenuItem(1, MF_BYPOSITION|MF_GRAYED|MF_DISABLED);
}
}