code: protected function buildTblOpt()/*# : array */
      {
          $result = [];
  
          foreach ($this->tbl_option as $opt) {
              $result[] = $opt;
          }
          if (empty($result)) {
              $result[] = '';
          }
  
          return $result;
      }
docs: Build table options
  
  @return array
  @access protected