code: public function Field($properties = array ())
      {
          Requirements::css(BETTER_BUTTONS_DIR . '/css/dropdown_form_action.css');
          Requirements::javascript(BETTER_BUTTONS_DIR . '/javascript/dropdown_form_action.js');
          $this->setAttribute('data-form-action-dropdown', '#' . $this->DropdownID());
  
          return parent::Field();
      }
docs: Renders the button, includes the JS and CSS
  @param array $properties