public function CSSClasses($stopAtClass = 'DataObject')
    {
        $classes = strtolower(parent::CSSClasses($stopAtClass));

        if (!empty($classes) && ($prefix = $this->blockManager->getPrefixDefaultCSSClasses())) {
            $classes = $prefix.str_replace(' ', " {$prefix}", $classes);
        }

        if ($this->blockManager->getUseExtraCSSClasses()) {
            $classes = $this->ExtraCSSClasses ? $classes." $this->ExtraCSSClasses" : $classes;
        }

        return $classes;
    }