CMFCMenuBar not customizable but still affected by the customize dialog.

// This is the main menu class. We have derived our own class to be able to
// for example block customization.
class IaMenuBar : public CMFCMenuBar
{
  DECLARE_SERIAL(IaMenuBar)
public:
  IaMenuBar();
  virtual ~IaMenuBar();

  virtual BOOL CreateEx( CWnd* pParentWnd,
                         DWORD dwCtrlStyle,
                         DWORD dwStyle,
                         CRect rcBorders,
                         UINT  nID );
  virtual BOOL RestoreOriginalState();   // TBD: Is not called???
  virtual BOOL CanBeRestored() const;
  virtual BOOL LoadState(LPCTSTR lpszProfileName = NULL, int nIndex = -1, UINT uiID = (UINT)-1);
  virtual BOOL SaveState(LPCTSTR lpszProfileName = NULL, int nIndex = -1, UINT uiID = (UINT)-1);

  afx_msg void OnContextMenu(CWnd* pWnd, CPoint pos);
  virtual void OnReset();   // TBD: Is not called???

private:
  DECLARE_MESSAGE_MAP()
};

#include "IaPch.h"
#include "IaMenuBar.h"

IMPLEMENT_SERIAL(IaMenuBar, CMFCMenuBar, VERSIONABLE_SCHEMA | 1)

//{{AFX_MSG_MAP(IaMenuBar)
BEGIN_MESSAGE_MAP(IaMenuBar, CMFCMenuBar)
  ON_WM_CONTEXTMENU()
END_MESSAGE_MAP()
//}}AFX_MSG_MAP

IaMenuBar::
IaMenuBar()
: CMFCMenuBar()
{
  m_bDisableCustomize = TRUE;
}

IaMenuBar::
~IaMenuBar()
{
}

BOOL 
IaMenuBar::
CreateEx( CWnd* pParentWnd,
          DWORD dwCtrlStyle,
          DWORD dwStyle,
          CRect rcBorders,
          UINT  nID )
{
  if (!__super::CreateEx(pParentWnd, dwCtrlStyle, dwStyle, rcBorders, nID))
  {
    return FALSE;
  }
  return TRUE;
}

BOOL 
IaMenuBar::
RestoreOriginalState()
{
  // Skip restoring of the state, since we don't allow customization and
  // we don't want our inserted menus to be replaced by the insertion
  // points.
  return TRUE;
  // TBD: This function is not called!
}

BOOL
IaMenuBar::
CanBeRestored() const
{
  return FALSE;
}

BOOL 
IaMenuBar::
LoadState(LPCTSTR lpszProfileName /*= NULL*/, int nIndex /*= -1*/, UINT uiID /*= (UINT)-1*/)
{
  // Skip loading of the state, since we don't allow customization and
  // we want to control what the menu looks like ourselves.
  return TRUE;
}

BOOL 
IaMenuBar::
SaveState(LPCTSTR lpszProfileName /*= NULL*/, int nIndex /*= -1*/, UINT uiID /*= (UINT)-1*/)
{
  // Skip saving of the state, since we don't allow customization and
  // we want to control what the menu looks like ourselves.
  return TRUE;
}

void
IaMenuBar::
OnContextMenu(CWnd* pWnd, CPoint pos)
{
  // Prevent the context menu from appearing if the customize dialog is
  // open. That context menu is for customizing the menu, which we have
  // disabled.
  if (IsCustomizeMode())
    return;

  CMFCMenuBar::OnContextMenu(pWnd, pos);
}

void
IaMenuBar::
OnReset()
{
  // Prevent the context menu from appearing if the customize dialog is
  // open. That context menu is for customizing the menu, which we have
  // disabled.
  if (IsCustomizeMode())
    return;

  CMFCMenuBar::OnReset();
}

class IaMainFrame : 
  public IfMDIFrameWnd,...

private:
...
  // control bar embedded members
  IaMenuBar           m_wndMenuBar;

int
IaMainFrame::
OnCreate(LPCREATESTRUCT lpCreateStruct)
{
  if (IfMDIFrameWnd::OnCreate(lpCreateStruct) == -1)
    return -1;

  if (!m_wndMenuBar.Create(this))
  {
    TRACE0("Failed to create menubar\n");
    return -1;
  }
  m_wndMenuBar.SetPaneStyle(CBRS_BORDER_TOP | CBRS_TOP | CBRS_SIZE_FIXED |
    CBRS_TOOLTIPS | CBRS_FLYBY);

...

  // If I use CBRS_ALIGN_TOP instead of CBRS_ALIGN_ANY here the menu appears 
  // under the toolbar, for some reason.
  m_wndMenuBar.EnableDocking(CBRS_ALIGN_ANY);
  EnableDocking(CBRS_ALIGN_TOP);
  DockPane(&m_wndMenuBar);

...
}

void
IaMainFrame::
UpdateMenuBar()
{
  // Found no other way (than being brutal) to make the CMFCMenuBar rebuild what it displays.
  HMENU hMenu = m_wndMenuBar.GetHMenu();
  m_wndMenuBar.CreateFromMenu(hMenu, TRUE, TRUE);
}