attempt to bind to local notification manager.

samples/ControlCatalog/MainWindow.xaml

@@ -5,7 +5,7 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:vm="clr-namespace:ControlCatalog.ViewModels"
         xmlns:v="clr-namespace:ControlCatalog.Views"
-        x:Class="ControlCatalog.MainWindow">
+        x:Class="ControlCatalog.MainWindow" LocalNotificationManager="{Binding NotificationManager}">
     <Window.DataTemplates>
         <DataTemplate DataType="vm:NotificationViewModel">
             <v:NotificationView />

samples/ControlCatalog/ViewModels/MainWindowViewModel.cs

@@ -4,19 +4,26 @@ using System.Text;
 using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls.Notifications;
+using Avalonia.Diagnostics.ViewModels;
 using Avalonia.Threading;
+using ReactiveUI;
 
 namespace ControlCatalog.ViewModels
 {
-    class MainWindowViewModel
+    class MainWindowViewModel : ViewModelBase
     {
         public MainWindowViewModel()
         {
+            this.WhenAnyValue(x => x.NotificationManager).Subscribe(x =>
+            {
+
+            });
+
             Dispatcher.UIThread.InvokeAsync(async () =>
             {
                 await Task.Delay(5000);
 
-                
+
                 Application.Current.MainWindow.LocalNotificationManager.Show(new NotificationViewModel { Title = "Warning", Message = "Please save your work before closing." });
 
                 await Task.Delay(1500);
@@ -33,5 +40,13 @@ namespace ControlCatalog.ViewModels
 
             });
         }
+
+        private INotificationManager _notificationManager;
+
+        public INotificationManager NotificationManager
+        {
+            get { return _notificationManager; }
+            set { this.RaiseAndSetIfChanged(ref _notificationManager, value); }
+        }
     }
 }

src/Avalonia.Controls/TopLevel.cs

@@ -52,7 +52,7 @@ namespace Avalonia.Controls
         /// Defines the <see cref="LocalNotificationManager"/> property.
         /// </summary>
         public static readonly DirectProperty<TopLevel, INotificationManager> LocalNotificationManagerProperty =
-            AvaloniaProperty.RegisterDirect<TopLevel, INotificationManager>(nameof(LocalNotificationManager), o => o.LocalNotificationManager);
+            AvaloniaProperty.RegisterDirect<TopLevel, INotificationManager>(nameof(LocalNotificationManager), o => o.LocalNotificationManager, defaultBindingMode: Data.BindingMode.OneWayToSource);
 
         /// <summary>
         /// Defines the <see cref="SystemNotificationManager"/> property.