Bug in 2.2.1 ( on 2014–05–27) – addUpload

I have simple form:

    ////////////////////////////////////////////////////////////////////////////
    protected function createComponentMyForm()
    {
        $form = new Form();

        $form->addUpload('avatar', 'Avatar:');

        $form->addSubmit( 'submit', 'Save' );

        $form->onSuccess[] = $this->saveMyFormSucceeded;

        return $form;
    }

    public function saveMyFormSucceeded( $form )
    {
        $values = $form->getValues();

        dump( $values["avatar"] );
        dump( $values["avatar"]->isOk() );
        dump( $values["avatar"]->getContents() );
        exit();
    }
    ////////////////////////////////////////////////////////////////////////////

dump( $values[“avatar”] );
Have allways (i tried many different files): error private ⇒ 6
dump( $values[“avatar”]->isOk() ); is allways FALSE
dump( $values[“avatar”]->getContents() ); is allways NULL

Bug? Why?