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