Fix nullable warning

MaterialDesignInXAML · Keboo · Apr 15, 2022 · Feb 10, 2022 · Feb 14, 2022 · Feb 14, 2022
commit bd3a881de24e4e105eeae3ca3bf7ac8ee931dd15
diff --git a/MaterialDesign3.Demo.Wpf/Domain/MainWindowViewModel.cs b/MaterialDesign3.Demo.Wpf/Domain/MainWindowViewModel.cs
@@ -84,7 +84,7 @@ public MainWindowViewModel(ISnackbarMessageQueue snackbarMessageQueue)
             AddNewNotificationCommand = new AnotherCommandImplementation(
                 _ => DemoItems[0].AddNewNotification());
 
-            AddNewNotificationCommand.Execute(null);
+            AddNewNotificationCommand.Execute(new object());
         }
 
         private readonly ICollectionView _demoItemsView;