/**
* Prepare layout
*
* Add button that clears customer's shopping cart
*
* @return $this
*/
protected function _prepareLayout()
{
$deleteAllConfirmString = __('Are you sure you want to delete all items from shopping cart?');
$this->addChild('empty_customer_cart_button', 'Magento\\Backend\\Block\\Widget\\Button', ['label' => __('Clear Shopping Cart'), 'onclick' => 'order.clearShoppingCart(\'' . $deleteAllConfirmString . '\')']);
return parent::_prepareLayout();
}
