Nette\Forms\Form::render PHP Method

    public function render(...$args)
    {
        $this->fireRenderEvents();
        echo $this->getRenderer()->render($this, ...$args);
    }

 /**
  * @param Form $form
  * @param array $args
  */
 private static function renderFormBegin(Form $form, array $args)
 {
     if ($form->getRenderer() instanceof BootstrapRenderer) {
         $form->render('begin', $args);
     } else {
         Nette\Bridges\FormsLatte\FormMacros::renderFormBegin($form, $args);
     }
 }