void MainWindow_Loaded(object sender, RoutedEventArgs e)
 {
     this.DataContext = _Model;
     if (_Model.IsRecordLoaded || _Model.InDesignMode || _Model.InDemo)
     {
         _Model.Refresh();
     }
     if (_Model.InDesignMode)
     {
         SalesOrderViewModel importFile = _Model._Proxy.GetDummyFile();
         importFile._ShowAll         = false;
         repairOrderList.ItemsSource = importFile.Items;
         _Model.CurrentParent        = importFile;
         importFile.IsNewItemEnabled = true;
         _Model.InDemo = true;
         importFile.SelectAll();
         _Model._Filter   = "Search";
         _Model.IsRunning = true;
     }
     _Model._Proxy.MainWindowLoaded();
 }