Hrátky s form replikátorem z Nette

HomepagePresenter.php

/*
* Tento příklad vychází z Sandbox z http://addons.nette.org/cs/form-container-replicator
* resp. správně nastavené rozlišení form replikator
*/

<?php
use Nette\Forms\Container;
use Nette\Application\UI\Form;

/**
 * Homepage presenter.
 */
class HomepagePresenter extends BasePresenter
{
    /**
     * @var array of some items
     */
    private $itemsR =  array(
        1 => "položka 1",
        2 => "položka 2",
        3 => "položka 3",
        4 => "položka 4",
    );

    /**
     * @return Nette\Application\UI\Form
     */
    protected function createComponentForm2()
    {
        $form = new Form;

        $presenter = $this;
        $invalidateCallback = function () use ($presenter) {
            /** @var \Nette\Application\UI\Presenter $presenter */
           // $presenter->invalidateControl('itemsForm');
        };

        foreach( $this->itemsR as $id => $item ) {
            $form->addDynamic("items$id",  function (Container $container) use ($invalidateCallback, $item) {
                $container->currentGroup = $container->form->addGroup("$item", FALSE);
                $container->addCheckbox('do', "vybrat");
            }, 1);
        }
        $form->addSubmit('ok', 'ok');
        $form->onSuccess[] = $this->Form2Submitted;
        $this['form2'] = $form;
        return $form;
    }

    /**
     * @param Nette\Application\UI\Form $form
     */
    public function Form2Submitted(Form $form)
    {
        $values = $form->getValues(true);
        echo("<pre>" . print_r($values, true) . "</pre>");
        die();
    }
}