/**
  * Make a renderer for this form.
  * This is deferred to the {@link CONTEXT} on which the form is based, so that the user can customize
  * form rendering from one spot.
  * @return FORM_RENDERER
  */
 public function make_renderer()
 {
     $Result = parent::make_renderer();
     $Result->preview_enabled = $this->preview_enabled;
     return $Result;
 }