поле в окно заказа

$modx->controller->addHtml("
            <script type='text/javascript'>
            Ext.ComponentMgr.onAvailable('minishop2-window-order-update', function(){
                var newField = {  
                    layout: 'column',
                    items: [
                        {
                            border: false,
                            columnWidth: 0.5,
                            autoHeight: true,
                            layout: 'form',
                            items: {
                                xtype: 'textfield',
                                name: 'speed',
                                fieldLabel: 'Скорость доставки',
                            }
                        }
                    ],
                    autoHeight: true,
                }
                this.fields.items[2].items.unshift(newField);
            });            
            </script>");