/**
  * Add drafting to the renderer, if allowed.
  * @return FORM_RENDERER
  */
 public function make_renderer()
 {
     $Result = parent::make_renderer();
     $Result->drafts_enabled = $this->value_for('draft');
     if ($Result->drafts_enabled) {
         $this->button = 'Publish';
     }
     return $Result;
 }