code: public function isId($id)
      {
          for ($i = 0, $count = count($this->widgets); $i < $count; $i++) {
              if ($this->widgets[$i]->isId($id)) {
                  return true;
              }
          }
  
          return false;
      }
docs: Scans the widgets for one with the appropriate ID field.
  
  @param string $id        ID value to try.
  
  @return bool          True if matched.