protected function setFormDataPanesCheckout()
    {
        $panes = array('login', 'review', 'payment_methods',
            'shipping_methods', 'shipping_address', 'payment_address', 'comment', 'action');

        foreach ($panes as $pane) {
            $this->data_form["pane_$pane"] = $this->render("checkout/panes/$pane", $this->data_form);
        }
    }