code: public function getVariants($objFilter)
      {
          if ($this->isVariantBase()) {
              return $this->getMetaModel()->findVariants(array($this->get('id')), $objFilter);
          }
  
          return null;
      }
docs: Fetch the meta model variants for this item.
  
  @param IFilter $objFilter The filter settings to be applied.
  
  @return IItems|null A list of all variants for this item.