/**
  * @internal
  * @access private
  */
 public static function _register_content_block(&$content_obj, &$contentBlock)
 {
     # do not process blocks with same id twice
     if (isset(self::$_content_blocks[$content_obj->Id()][$contentBlock->GetProperty('id')])) {
         self::$_content_blocks[$content_obj->Id()][$contentBlock->GetProperty('id')]->SetProperty('multiple', true);
         return;
     }
     $AC =& ac_utils::get_module('AdvancedContent');
     $block_id = $contentBlock->GetProperty('id');
     # this block has been added to the template after page has been created?
     if (!$content_obj->HasProperty($block_id)) {
         $contentBlock->SetProperty('new_block', true);
     }
     # ToDo: how remove the backend stuff from this class without need to loop through all content blocks again?
     if (!ac_utils::is_frontend_request()) {
         $type = $contentBlock->Type();
         if (!isset(self::$_block_types[$type])) {
             self::$_block_types[$type] = array('content_blocks' => array(), 'header_html_called' => false, 'props' => array());
         }
         self::$_block_types[$type]['content_blocks'][$block_id] = $block_id;
         acTabManager::SetTabs($content_obj, $contentBlock);
         if ($contentBlock->Type() != AC_INVALID_BLOCK_TYPE) {
             if ($contentBlock->GetProperty('smarty')) {
                 foreach ($contentBlock->GetProperties() as $propName => $propValue) {
                     $contentBlock->SetProperty($propName, ac_utils::DoSmarty($content_obj, $propValue));
                 }
             }
             $value = $contentBlock->GetContent();
             if ($content_obj->Id() < 0 && $value == '' || $value == '' && !$contentBlock->GetProperty('allow_none') || $contentBlock->GetProperty('new_block')) {
                 $value = $contentBlock->GetProperty('default');
             }
             $content_obj->SetPropertyValueNoLoad($block_id, $value);
             $block_display = true;
             if ($contentBlock->GetProperty('collapsible')) {
                 $block_display = ac_admin_ops::GetVisibility('block', $block_id, $content_obj->Id(), $content_obj->TemplateId(), !$contentBlock->GetProperty('collapse'));
                 $contentBlock->SetProperty('pref_url', str_replace('&amp);', '&', $AC->CreateLink('m1_', 'savePrefs', '', $AC->lang('toggle_block'), array('item_type' => 'block', 'disable_theme' => true, 'edit_content' => true, 'content_id' => $content_obj->Id(), 'template_id' => $content_obj->TemplateId(), 'item_id' => $block_id, 'item_display' => !$block_display), '', true)));
             }
             $contentBlock->SetProperty('display', $block_display);
         }
         if (strtolower($contentBlock->GetProperty('label')) == 'content_en') {
             $contentBlock->SetProperty('label', lang('content'));
         }
         if ($contentBlock->GetProperty('translate_labels')) {
             $contentBlock->SetProperty('label', $AC->lang($contentBlock->GetProperty('label')));
         }
         # deprecated (should not be needed since CMSms 1.11)
         if ($contentBlock->GetProperty('multiple') && ac_admin_ops::GetVisibility('message', $block_id, $content_obj->Id(), $content_obj->TemplateId())) {
             $hide_link = str_replace('&amp;', '&', $AC->CreateLink('m1_', 'savePrefs', '', $AC->lang('toggle_message'), array('item_type' => 'message', 'disable_theme' => true, 'edit_content' => true, 'content_id' => $content_obj->Id(), 'template_id' => $content_obj->TemplateId(), 'item_id' => $block_id, 'item_display' => 0), '', false, '', 'onclick="jQuery.get(this.href); jQuery(\'#' . $block_id . '_message\').toggle(\'fast\',function(){jQuery(this).remove()}); return false;"'));
             $contentBlock->SetProperty('message', $AC->lang('notice_duplicatecontent', $contentBlock->GetProperty('name')) . ' (' . $hide_link . ')');
         }
         #---
         $contentBlock->SetBlockTypeProperties();
     }
     if ($contentBlock->Type() != AC_INVALID_BLOCK_TYPE && ac_utils::is_frontend_request() || !ac_utils::is_frontend_request()) {
         $content_obj->AddExtraProperty($block_id);
         # backward compatibility (deprecated)
         self::$_content_blocks[$content_obj->Id()][$block_id] = $contentBlock;
     }
 }