static function ValidateSummary()
    {
        $erros = ModelState::getErrors();
        if (count($erros) > 0):
            $html = '<ul class="validate-summary">';

            foreach ($erros as $erro) {
                $html .= '<li>' . $erro . '</li>';
            }

            $html .= '</ul>';

            echo $html;
        endif;
    }