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);
}



#### editace


public function actionEdit($id = 0)
{
    $this->entity = $this->model->get($id);
    if (!$this->entity) {
        throw new Nette\Application\BadRequestException;
    }
}

protected function createComponentEditForm($name)
{
    if (!$this->entity) {
        throw new Nette\Application\BadRequestException;
    }

    $this[$name] = $form = new Nette\Application\UI\Form;

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

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