protected function findForm($method, $attribute)
    {
        if (is_integer($this->focus)) {
            return $this->findFormInFrame(
                    $this->frames[$this->focus],
                    $this->focus,
                    $method,
                    $attribute);
        }
        for ($i = 0; $i < count($this->frames); $i++) {
            $form = $this->findFormInFrame(
                    $this->frames[$i],
                    $i,
                    $method,
                    $attribute);
            if ($form) {
                return $form;
            }
        }

        return;
    }