class MyForm extends Nette\Application\AppForm
{

    public function __construct(Nette\ComponentContainer $parent, $name)
    {
        parent::__construct($parent, $name);

        $this->addText(...
        $this->addSelect(...
        $form->addSubmit(...
    }

}

// ...

protected function createComponentMyForm($name)
{
    return new MyForm();
}


####### ... nebo containery

class MyContainer extends Nette\Forms\FormContainer
{

    public function __construct()
    {
        parent::__construct();

        $this->addText(...
        $this->addSelect(...
    }

}

// ...

protected function createComponentMyForm($name)
{
    $form = new Nette\Application\AppForm($this, $name);
    $form['neco'] = new MyContainer;

    $form->addSubmit(...
}