Nette dynamic form [bad practise]

<?php
use Nette\Application\UI\Form,
    Nette\Forms\Controls\SubmitButton;

/**
 * Homepage presenter.
 *
 * @author     John Doe
 * @package    MyApplication
 */
class HomepagePresenter extends BasePresenter
{

    public function renderDefault()
    {
        $this->template->anyVariable = 'any value';
    }



    protected function createComponentTestForm()
    {
        $form = new Form();
        $form->addSelect('item', 'Položka', array(1 => 'Foo', 2 => 'Bar', 3 => 'Baz'));
        $form->addSubmit('send', 'Odeslat')
            ->onClick[] = callback($this, 'addSubitemToForm');

        return $form;
    }

    public function addSubitemToForm(SubmitButton $button)
    {
        $this['testForm']->addSelect('subitem', 'Pod-položky', array(1 => 'Subfoo', 2 => 'Subbar', 3 => 'Subbaz'));
        $this['testForm']->addSubmit('delete', 'Smaž')
            ->onClick[] = callback($this, 'deleteSubitem');
    }

    public function deleteSubitem(SubmitButton $button)
    {
        dump("Jsem zde, už stačí jen smazat co potřebuji a redirectnout.");
    }

}