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I have a popup menu which is dynamically populated with menu items based on application context. In some cases there will not be any menu items for this popup menu. In this case I need to disable the popup menu. How would I go about doing this?

To disable the entire popup menu, you should handle the CExtPopupMenuWnd::g_nMsgPrepareOneMenuLevel registered message. The code below disables the Toolbars sub menu.

LRESULT CMainFrame::OnExtMenuPrepare(WPARAM wParam, LPARAM lParam)
{
    CExtPopupMenuWnd::MsgPrepareMenuData_t * pData =
        reinterpret_cast
        < CExtPopupMenuWnd::MsgPrepareMenuData_t * >
        ( wParam );
    ASSERT( pData != NULL );
    CExtPopupMenuWnd * pPopup = pData->m_pPopup;
    ASSERT( pPopup != NULL );
    
    INT nItemPos = pPopup->ItemFindByText( _T("&Toolbars") );
    if( nItemPos > 0 )
    {
        CExtPopupMenuWnd::MENUITEMDATA & _mii = pPopup->ItemGetInfo( nItemPos );
        if( _mii.IsPopup() )
            _mii.SetForcePopupDisabled( true );
    }

    return 1L;
}