protected function getExtProperties()
 {
     $aProps = parent::getExtProperties();
     $aProps['fields'] = $this->getArrayFields();
     return $aProps;
 }
 public function __construct($type, $name, $title = 'Label')
 {
     parent::__construct($name);
     $this->setType($type);
     $this->setTitle($title);
 }