17.1, 17.0 ... Ribbon Groups Popup bug

Hello.

Can some one explain fairy sense of code from:
BOOL CXTPRibbonGroupControlPopup::OnSetPopup(BOOL bPopup)
{
    m_bPopup = bPopup;
    if (bPopup)
    {
        CMDTARGET_RELEASE(m_pCommandBar);

        CXTPCommandBars* pCommandBars = m_pParent->GetCommandBars();
        ASSERT(pCommandBars);

        if (!m_pPopupGroup)
        {
            m_pCommandBar = new CXTPPopupToolBar();
            m_pCommandBar->SetCommandBars(pCommandBars);
            m_pCommandBar->Popup(this, IsKeyboardSelected(GetSelected()));
        }
        else
        {

            m_pCommandBar = new CXTPRibbonGroupPopupToolBar(m_pPopupGroup);
            m_pCommandBar->SetCommandBars(pCommandBars);

            m_pCommandBar->EnableCustomization(FALSE);
            m_pCommandBar->Popup(this, IsKeyboardSelected(GetSelected()));
        }
    }
    else
    {
        ASSERT(m_pCommandBar);

        if (m_pCommandBar)
        {
            m_pCommandBar->SetTrackingMode(FALSE);

            if (m_pPopupGroup)
            {
                // we need to copy the popped ribbon group to the existing (in order not to lose user's changes)

                CXTPRibbonGroupPopupToolBar *pPopupToolbar = DYNAMIC_DOWNCAST(CXTPRibbonGroupPopupToolBar, m_pCommandBar);

                if (pPopupToolbar && pPopupToolbar->m_pRibbonGroup)
                {
                    m_pPopupGroup->RemoveAll();
                    m_pPopupGroup->Copy(pPopupToolbar->m_pRibbonGroup);
                }
            }
        }
    }

    RedrawParent();
    return TRUE;
}

What is
                if (pPopupToolbar && pPopupToolbar->m_pRibbonGroup)
                {
                    m_pPopupGroup->RemoveAll();
                    m_pPopupGroup->Copy(pPopupToolbar->m_pRibbonGroup);
                }
doing?

For example I create in one group of a ribbon any CCombobox and store its pointer ....
After I need to get info from combo ... but unfortunately  the ribbon size bigger than screen... and ribbongroup become as popup group.
I get an exception as now pointer contain a garbage.