[solved] Ribbon bar artifact

void CXTPRibbonOffice2013Theme::DrawRibbonTab(CDC *pDC, CXTPRibbonTab *pItem)
{
......

    XTPRibbonTabContextColor tabColor = pItem->GetContextColor();
    XTPTabPosition tabPosition = pItem->GetTabManager()->GetPosition();

    CRect r(pItem->GetRect());
    CXTPTabPaintManagerTheme::InflateRectEx(r, CRect(-1, 1, -1, -1), tabPosition);
    BOOL bSelected = pItem->IsSelected();
    if (pRibbon->IsRibbonMinimized() && bSelected)
    {
        CXTPRibbonControlTab* pControlTab = (CXTPRibbonControlTab*)pItem->GetTabManager();
        if (pControlTab)
        {
            if (!pControlTab->GetCommandBar() || !pControlTab->GetCommandBar()->IsTrackingMode())
                bSelected = FALSE;
        }
    }

    if (bSelected)
    {
        r.DeflateRect(0, 0, 1, 0);
.....