code: public function modelToLabel(ModelToLabelEvent $event)
      {
          if (!$this->wantToHandle($event)) {
              return;
          }
  
          $model     = $event->getModel();
          $type      = $model->getProperty('type');
          $image     = '<img src="' . $this->attributeFactory->getIconForType($type) . '" />';
          $metaModel = $this->getMetaModelByModelPid($model);
  
          $attribute = $this->attributeFactory->createAttribute($model->getPropertiesAsArray(), $metaModel);
  
          if (!$attribute) {
              $translator = $event
                  ->getEnvironment()
                  ->getTranslator();
  
              $event
                  ->setLabel(
                      '<div class="field_heading cte_type"><strong>%s</strong> <em>[%s]</em></div>
                      <div class="field_type block">
                          <strong>%s</strong><br />
                      </div>'
                  )
                  ->setArgs(
                      array
                      (
                          $translator->translate('error_unknown_attribute.0', 'tl_metamodel_attribute'),
                          $type,
                          $translator->translate('error_unknown_attribute.1', 'tl_metamodel_attribute', array($type)),
                      )
                  );
              return;
          }
  
          $colName        = $attribute->getColName();
          $name           = $attribute->getName();
          $arrDescription = StringUtil::deserialize($attribute->get('description'));
          if (is_array($arrDescription)) {
              $description = $arrDescription[$attribute->getMetaModel()->getActiveLanguage()];
              if (!$description) {
                  $description = $arrDescription[$attribute->getMetaModel()->getFallbackLanguage()];
              }
          } else {
              $description = $arrDescription ?: $attribute->getName();
          }
  
          $event
              ->setLabel(
                  '<div class="field_heading cte_type"><strong>%s</strong> <em>[%s]</em></div>
                  <div class="field_type block">
                      %s<strong>%s</strong> - %s
                  </div>'
              )
              ->setArgs(array(
                  $colName,
                  $type,
                  $image,
                  $name,
                  $description
              ));
      }
docs: Draw the attribute in the backend listing.
  
  @param ModelToLabelEvent $event The event.
  
  @return void