/**
  * Get all valid fieldtypes
  *
  * @return string[] the field type identifiers for all valid fields for the current MetaModel.
  */
 public function fieldTypesCallback($objDC)
 {
     $objMetaModel = MetaModelFactory::byId($objDC->getCurrentModel()->getProperty('pid'));
     return MetaModelAttributeFactory::getAttributeTypes($objMetaModel->isTranslated(), $objMetaModel->hasVariants());
 }