How to hide the menu bar ?

Hi,

My question is simple, but I would to do to it with an easy way !!
How to hide the menu bar ?
And, how to show it after ?

Thanks in advance.
Frédéric Naudeau.

void CMainFrame::OnViewImgdataToolbar()
{
BOOL bIsVisible = (m_wndImgDataToolBar.GetStyle() & WS_VISIBLE);
ShowControlBar(&m_wndImgDataToolBar, !bIsVisible, FALSE);
}