public function initialize() {
        $primaryKey = $this->getProperty($this->primaryKeyField,false);
        if (empty($primaryKey)) return $this->modx->lexicon($this->objectType.'_err_ns');
        $this->object = $this->modx->getObject($this->classKey,$primaryKey);
        if (empty($this->object)) return $this->modx->lexicon($this->objectType.'_err_nfs',array($this->primaryKeyField => $primaryKey));