modify ui

lib/app.dart

@@ -1,3 +1,4 @@
+import 'package:fcs/model/discount_model.dart';
 import 'package:fcs/model/shipment_model.dart';
 import 'package:fcs/model_fcs/message_model.dart';
 import 'package:fcs/model_fcs/package_model.dart';
@@ -77,6 +78,7 @@ class _AppState extends State<App> {
   final MessageModel messageModel = new MessageModel();
   final InvoiceModel invoiceModel = new InvoiceModel();
   final CustomerModel customerModel = new CustomerModel();
+  final DiscountModel discountModel = new DiscountModel();
 
   AppTranslationsDelegate _newLocaleDelegate;
 
@@ -115,7 +117,8 @@ class _AppState extends State<App> {
       ..addModel(messageModel)
       ..addModel(shipmentRateModel)
       ..addModel(invoiceModel)
-      ..addModel(customerModel);
+      ..addModel(customerModel)
+      ..addModel(discountModel);
     this.mainModel.init();
   }
 
@@ -173,6 +176,7 @@ class _AppState extends State<App> {
         ChangeNotifierProvider(builder: (context) => messageModel),
         ChangeNotifierProvider(builder: (context) => invoiceModel),
         ChangeNotifierProvider(builder: (context) => customerModel),
+        ChangeNotifierProvider(builder: (context) => discountModel),
         ChangeNotifierProvider(
           builder: (context) => testModel,
         ),