protected function createComponentForm($name)
{
    $this[$name] = $form = new Nette\Application\UI\Form;

    $pairs = array('a', 'b', 'c'); // třeba z databáze
    $form->addSelect('one', 'One', $pairs);

    $pairsTwo = $this->model->findBy($form['one']->value); // vytahne zavisle
    // $pairsTwo = array('d', 'e', 'f');
    $form->addSelect('two', 'Two', $pairsTwo);
}