protected function _toHtml()
    {
        if (!$this->getOptions()) {
            $cmsPages = $this->cmsPageCollection->addStoreFilter($this->getStoreFromContext());
            foreach ($cmsPages as $cmsPage) {
                /** @var \Magento\Cms\Model\Page $cmsPage */
                $this->addOption($cmsPage->getId(), $cmsPage->getTitle());
            }
        }

        return parent::_toHtml();
    }