private function addShippingOptions(Order $order, FormInterface $form)
    {
        if ($order->getShippingMethod() instanceof ShippingMethod) {
            $provider = $this->getOptionsProvider($order->getShippingMethod());
            if ($provider instanceof ShippingMethodOptionsProviderInterface) {
                $form->addChild($this->getElement('select', [
                    'name'    => 'shippingMethodOption',
                    'label'   => 'order.label.shipping_method',
                    'options' => $provider->getShippingOptions(),
                ]));
            }
        }
    }