How to I change the ribbon bar after closing main frame

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C++

MFC

Hello everyone.

I am developing a new MFC Multiple Top Level Document Application.

At the moment i am trying to figure a way to change the ribbon bar of a MainFrm
dynamically at two certain points of the application's lifecycle.

The first one is when the app has just opened and no document is opened yet. At this point i suppose that the application is in a initial state.
So, the first frame has a ribbon bar with some basic controls. When the user selects to create a new frame or open a saved document,
then instead of opening a new frame window, i "convert" the already opened window by loading another ribbon resource.

The code i achieve this is the following:

void CMyAppMainFrame::LoadRibbonFromUINT(UINT ribbon_res) 
{
    //close cats/tabs to avoid appending when new ribbon opens
    m_wndRibbonBar.RemoveAllCategories();
    m_wndRibbonBar.RemoveAllFromTabs();

    //close ribbon bar
    RemovePaneFromDockManager(&m_wndRibbonBar, TRUE, TRUE, FALSE, NULL);

    VERIFY(m_wndRibbonBar.Create(this));
    VERIFY(m_wndRibbonBar.LoadFromResource(ribbon_res));
	m_wndRibbonBar.ForceRecalcLayout();
}

This step works fine.

The second case is when the user has only one document open and closes it.
In this case i want to keep the document open and just change the ribbon bar back to the basic one.
The user can close the document in two ways.

• The first one is from the main menu (Main Button -> Close). This action calls the
  C++

  CMyAppDoc::OnCloseDocument().

  
  Inside the OnCloseDocument i trace that this is the last document open, so i keep it alive and load the basic ribbon bar.
  



• The second way is when the user presses the top right X button to close it.
  Then the overriden function CMyAppMainFrame::OnClose is called.
  Inside there i call the CMyAppDoc::OnCloseDocument() which (as before) checks that this is the last document, so instead of closing, calls the CMyAppMainFrame::LoadRibbonFromUINT in order to load the basic RibbonBar.
  

The first way works just fine!
But when i press the top right X button, although the control is also sent to CMyAppDoc::OnCloseDocument(), when the m_wndRibbonBar.ForceRecalcLayout() is called i get an exception.

I suppose that when i press the X button, perhaps the MFC frameworks invalidates some of FrameWnd members before the control reaches the CMyAppMainFrame::OnClose.
So when i try to recalc the RibbonBar layout, i get the exception.

Does anyone have a deeper understanding on the closing mechanism of MFC and how i could overcome this behaviour?

Thank you in advance!

What I have tried:

void CMyAppMainFrame::LoadRibbonFromUINT(UINT ribbon_res) 
{
    //close cats/tabs to avoid appending when new ribbon opens
    m_wndRibbonBar.RemoveAllCategories();
    m_wndRibbonBar.RemoveAllFromTabs();

    //close ribbon bar
    RemovePaneFromDockManager(&m_wndRibbonBar, TRUE, TRUE, FALSE, NULL);

    VERIFY(m_wndRibbonBar.Create(this));
    VERIFY(m_wndRibbonBar.LoadFromResource(ribbon_res));
	m_wndRibbonBar.ForceRecalcLayout();
}