Manually changing main menu in an MDI app

I have an application with several MDI-based editor windows (similar in appearance to Visual Studio/Dreamweaver, etc.), but it also has docking panes containing tree controls and properties which are not doc/view windows. Using the CMultiDocTemplate template class, I faithfully registered each editor document type with its own resources (menus, accelerator tables, etc.) and menus change properly when you switch back and forth between different editor views as expected. However, I cannot seem to manually load menus when, for example, a pane containing a tree view of the document hierarchy gets focus. I tried the following code but strangely, when I look at it in the debugger, m_hMenuDefault is always NULL when entering the function, which obviously will not work (it's hard to destroy a menu that doesn't exist...)

void CMainFrame::SetMainMenu(UINT nIDResource)
{

    ASSERT(nIDResource);

    // Remove/destroy old menu
    SetMenu(NULL);
    ::DestroyMenu(m_hMenuDefault);

    // Add the requested menu
    m_defaultMenu.LoadMenu(nIDResource);
    ASSERT(m_defaultMenu);

    SetMenu(&m_defaultMenu);
    m_hMenuDefault = m_defaultMenu.m_hMenu;

}

Thanks in advance,

Jay

try.

pCommandBars->GetMenuBar()->LoadMenu