public function setButtonSubmit($submitButton)
    {
        if (\is_string($submitButton)) {
            $this->submitButton = CmsButton::getInstance($submitButton);
        } elseif ($submitButton instanceof CmsButton) {
            $this->submitButton = $submitButton;
        } else {
            throw new InvalidArgumentException('setButtonSubmit parameter type must be String or CmsButton.');
        }

        return $this;
    }