public function removeLastBreadcrumb()
    {
        //obliczanie indeksu ostatniego breadcrumba
        $index = count($this->_breadcrumbsData) - 1;
        //brak breadcrumba
        if (!isset($this->_breadcrumbsData[$index])) {
            return $this;
        }
        //usuwanie
        unset($this->_breadcrumbsData[$index]);
        //przebudowa breadcrumbów
        return $this->_buildBreadcrumbs();
    }