public function get_name($usr = null){
    if ( $this->auth ){
      if ( \is_null($usr) ){
        $usr = $this->get_session();
      }
      else if ( str::is_uid($usr) ){
        $mgr = $this->get_manager();
        $usr = $mgr->get_user($usr);
      }
      if ( isset($usr[$this->class_cfg['show']]) ){
        return $usr[$this->class_cfg['show']];
      }
    }
    return false;
  }