diff --git a/Hyperbar.Windows.Contextual/ContextualWidgetViewModel.cs b/Hyperbar.Windows.Contextual/ContextualWidgetViewModel.cs
index 7127b49..c9028fe 100644
--- a/Hyperbar.Windows.Contextual/ContextualWidgetViewModel.cs
+++ b/Hyperbar.Windows.Contextual/ContextualWidgetViewModel.cs
@@ -1,4 +1,5 @@
-namespace Hyperbar.Widget.Contextual;
+
+namespace Hyperbar.Widget.Contextual;
 
 public class ContextualWidgetViewModel :
     ObservableCollectionViewModel<IWidgetComponentViewModel>,
@@ -6,8 +7,9 @@ public class ContextualWidgetViewModel :
     ITemplatedViewModel
 {
     public ContextualWidgetViewModel(ITemplateFactory templateFactory,
-        IServiceFactory serviceFactory,
-        IEnumerable<IWidgetComponentViewModel> items) : base(serviceFactory, items)
+        IServiceFactory serviceFactory, 
+        IMediator mediator, 
+        IEnumerable<IWidgetComponentViewModel> items) : base(serviceFactory, mediator, items)
     {
         TemplateFactory = templateFactory;
     }
diff --git a/Hyperbar.Windows.Primary/PrimaryWidgetConfigurationChangedHandler.cs b/Hyperbar.Windows.Primary/PrimaryWidgetConfigurationChangedHandler.cs
new file mode 100644
index 0000000..211d64e
--- /dev/null
+++ b/Hyperbar.Windows.Primary/PrimaryWidgetConfigurationChangedHandler.cs
@@ -0,0 +1,22 @@
+namespace Hyperbar.Windows.Primary;
+
+public class PrimaryWidgetConfigurationChangedHandler :
+    INotificationHandler<ConfigurationChanged<PrimaryWidgetConfiguration>>
+{
+    private readonly IMediator mediator;
+    private readonly IEnumerable<IWidgetComponentViewModel> items;
+
+    public PrimaryWidgetConfigurationChangedHandler(IMediator mediator,
+        IEnumerable<IWidgetComponentViewModel> items)
+    {
+        this.mediator = mediator;
+        this.items = items;
+    }
+
+    public async ValueTask Handle(ConfigurationChanged<PrimaryWidgetConfiguration> notification, 
+        CancellationToken cancellationToken)
+    {
+        await mediator.PublishAsync(new CollectionChanged<IEnumerable<IWidgetComponentViewModel>>(items), 
+            cancellationToken);
+    }
+}
diff --git a/Hyperbar.Windows.Primary/PrimaryWidgetProvider.cs b/Hyperbar.Windows.Primary/PrimaryWidgetProvider.cs
index ec42705..c554074 100644
--- a/Hyperbar.Windows.Primary/PrimaryWidgetProvider.cs
+++ b/Hyperbar.Windows.Primary/PrimaryWidgetProvider.cs
@@ -7,8 +7,8 @@ public class PrimaryWidgetProvider :
     IWidgetProvider
 {
     public void Create(HostBuilderContext comtext, IServiceCollection services) => 
-            services.AddConfiguration(comtext.Configuration.GetSection(nameof(PrimaryWidgetConfiguration)), 
-                PrimaryWidgetConfiguration.Defaults)
-            .AddHandler<WidgetComponentMappingHandler>()
+            services.AddConfiguration< PrimaryWidgetConfiguration>(comtext.Configuration.GetSection(nameof(PrimaryWidgetConfiguration)))
+            .AddHandler<WidgetComponentMapping>()
+            .AddHandler<PrimaryWidgetConfigurationChangedHandler>()
             .AddWidgetTemplate<PrimaryWidgetViewModel>();
 }
\ No newline at end of file
diff --git a/Hyperbar.Windows.Primary/PrimaryWidgetViewModel.cs b/Hyperbar.Windows.Primary/PrimaryWidgetViewModel.cs
index dae45db..f013476 100644
--- a/Hyperbar.Windows.Primary/PrimaryWidgetViewModel.cs
+++ b/Hyperbar.Windows.Primary/PrimaryWidgetViewModel.cs
@@ -1,4 +1,5 @@
- namespace Hyperbar.Windows.Primary;
+
+namespace Hyperbar.Windows.Primary;
 
 public class PrimaryWidgetViewModel :
     ObservableCollectionViewModel<IWidgetComponentViewModel>,
@@ -7,7 +8,8 @@ public class PrimaryWidgetViewModel :
 {
     public PrimaryWidgetViewModel(ITemplateFactory templateFactory, 
         IServiceFactory serviceFactory,
-        IEnumerable<IWidgetComponentViewModel> items) : base(serviceFactory, items)
+        IMediator mediator, 
+        IEnumerable<IWidgetComponentViewModel> items) : base(serviceFactory, mediator, items)
     {
         TemplateFactory = templateFactory;
     }
diff --git a/Hyperbar.Windows.Primary/WidgetComponentMapping.cs b/Hyperbar.Windows.Primary/WidgetComponentMapping.cs
index 579c491..68f53ad 100644
--- a/Hyperbar.Windows.Primary/WidgetComponentMapping.cs
+++ b/Hyperbar.Windows.Primary/WidgetComponentMapping.cs
@@ -1,13 +1,12 @@
 
-
 namespace Hyperbar.Windows.Primary;
 
-public class WidgetComponentMappingHandler(PrimaryWidgetConfiguration configuration,
+public class WidgetComponentMapping(PrimaryWidgetConfiguration configuration,
     IServiceFactory service,
     IMediator mediator) :
     IMappingHandler<PrimaryWidgetConfiguration, IEnumerable<IWidgetComponentViewModel>>
 {
-    public IEnumerable<IWidgetComponentViewModel> Map()
+    public IEnumerable<IWidgetComponentViewModel> Handle()
     {
         foreach (IPrimaryCommandConfiguration item in configuration)
         {
diff --git a/Hyperbar.Windows/App.xaml.cs b/Hyperbar.Windows/App.xaml.cs
index 93e0121..6af1fab 100644
--- a/Hyperbar.Windows/App.xaml.cs
+++ b/Hyperbar.Windows/App.xaml.cs
@@ -4,6 +4,7 @@ using Hyperbar.Windows.Primary;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
+using Microsoft.UI.Dispatching;
 using Microsoft.UI.Xaml;
 
 namespace Hyperbar.Windows;
@@ -17,6 +18,10 @@ public partial class App :
     {
         base.OnLaunched(args);
 
+        var context = new DispatcherQueueSynchronizationContext(
+                    DispatcherQueue.GetForCurrentThread());
+        SynchronizationContext.SetSynchronizationContext(context);
+
         IHost? host = Host.CreateDefaultBuilder()
             .UseContentRoot(AppContext.BaseDirectory)
             .ConfigureAppConfiguration(config =>
@@ -31,10 +36,11 @@ public partial class App :
                 services.AddSingleton<IServiceFactory>(provider =>
                     new ServiceFactory((type, parameters) => ActivatorUtilities.CreateInstance(provider, type, parameters!)));
 
+                services.AddSingleton<IMediator, Mediator>();
                 services.AddHostedService<AppService>();
+
                 services.AddTransient<IInitializer, AppInitializer>();
                 services.AddTransient<ITemplateFactory, TemplateFactory>();
-                services.AddTransient<ITemplateGeneratorFactory, TemplateGeneratorFactory>();
 
                 services.AddTransient<DesktopFlyout>();
                 services.AddContentTemplate<CommandViewModel, CommandView>();
diff --git a/Hyperbar.Windows/Lifecycles/IServiceCollectionExtensions.cs b/Hyperbar.Windows/Lifecycles/IServiceCollectionExtensions.cs
index 852c3eb..c6e8960 100644
--- a/Hyperbar.Windows/Lifecycles/IServiceCollectionExtensions.cs
+++ b/Hyperbar.Windows/Lifecycles/IServiceCollectionExtensions.cs
@@ -2,6 +2,7 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
+using Microsoft.UI.Dispatching;
 
 namespace Hyperbar.Windows
 {
@@ -11,6 +12,9 @@ namespace Hyperbar.Windows
             where TWidgetProvider :
             IWidgetProvider, new()
         {
+            DispatcherQueueSynchronizationContext context = new(DispatcherQueue.GetForCurrentThread());
+            SynchronizationContext.SetSynchronizationContext(context);
+
             TWidgetProvider builder = new();
             IHost? host = new HostBuilder()
                 .UseContentRoot(AppContext.BaseDirectory)
@@ -37,7 +41,6 @@ namespace Hyperbar.Windows
                     isolatedServices.AddContentTemplate<WidgetButtonViewModel, WidgetButtonView>();
 
                     isolatedServices.AddTransient<ITemplateFactory, TemplateFactory>();
-                    isolatedServices.AddTransient<ITemplateGeneratorFactory, TemplateGeneratorFactory>();
 
                     builder.Create(context, isolatedServices);
 
diff --git a/Hyperbar.Windows/Templates/DataTemplateConverter.cs b/Hyperbar.Windows/Templates/DataTemplateConverter.cs
new file mode 100644
index 0000000..0c365d7
--- /dev/null
+++ b/Hyperbar.Windows/Templates/DataTemplateConverter.cs
@@ -0,0 +1,11 @@
+using Microsoft.UI.Xaml.Controls;
+
+namespace Hyperbar.Windows;
+
+public class DataTemplateConverter : ValueConverter<object, DataTemplateSelector> 
+{
+    protected override DataTemplateSelector? ConvertTo(object value, Type? targetType, object? parameter, string? language)
+    {
+        return new TemplateGenerator();
+    }
+}
diff --git a/Hyperbar.Windows/Templates/ITemplateGeneratorFactory.cs b/Hyperbar.Windows/Templates/ITemplateGeneratorFactory.cs
deleted file mode 100644
index 574ca9a..0000000
--- a/Hyperbar.Windows/Templates/ITemplateGeneratorFactory.cs
+++ /dev/null
@@ -1,9 +0,0 @@
-using Microsoft.UI.Xaml;
-
-namespace Hyperbar.Windows
-{
-    public interface ITemplateGeneratorFactory
-    {
-        DataTemplate Create();
-    }
-}
\ No newline at end of file
diff --git a/Hyperbar.Windows/Templates/TemplateFactory.cs b/Hyperbar.Windows/Templates/TemplateFactory.cs
index d04907f..ca5374e 100644
--- a/Hyperbar.Windows/Templates/TemplateFactory.cs
+++ b/Hyperbar.Windows/Templates/TemplateFactory.cs
@@ -1,19 +1,11 @@
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.UI.Xaml;
-using Microsoft.UI.Xaml.Controls;
 
 namespace Hyperbar.Windows;
 
-public class TemplateFactory(ITemplateGeneratorFactory factory,
-    IEnumerable<IContentTemplateDescriptor> descriptors,
+public class TemplateFactory(IEnumerable<IContentTemplateDescriptor> descriptors,
     IServiceProvider provider) :
-    DataTemplateSelector,
     ITemplateFactory
 {
-    protected override DataTemplate SelectTemplateCore(object item) => factory.Create();
-
-    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container) => factory.Create();
-
     public object? Create(object key)
     {
         if (descriptors.FirstOrDefault(x => x.Key == key) is IContentTemplateDescriptor descriptor)
diff --git a/Hyperbar.Windows/Templates/TemplateGenerator.cs b/Hyperbar.Windows/Templates/TemplateGenerator.cs
new file mode 100644
index 0000000..4e9e18a
--- /dev/null
+++ b/Hyperbar.Windows/Templates/TemplateGenerator.cs
@@ -0,0 +1,30 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Markup;
+
+namespace Hyperbar.Windows;
+
+public class TemplateGenerator : DataTemplateSelector
+{
+    protected override DataTemplate SelectTemplateCore(object item)
+    {
+        string xamlString = @"
+                <DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
+                                xmlns:desktop='using:Hyperbar.Windows'>
+                    <desktop:TemplateGeneratorControl />
+                </DataTemplate>";
+
+        return (DataTemplate)XamlReader.Load(xamlString);
+    }
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+    {
+        string xamlString = @"
+                <DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
+                                xmlns:desktop='using:Hyperbar.Windows'>
+                    <desktop:TemplateGeneratorControl />
+                </DataTemplate>";
+
+        return (DataTemplate)XamlReader.Load(xamlString);
+    }
+}
diff --git a/Hyperbar.Windows/Templates/TemplateGeneratorFactory.cs b/Hyperbar.Windows/Templates/TemplateGeneratorFactory.cs
deleted file mode 100644
index 0e4196a..0000000
--- a/Hyperbar.Windows/Templates/TemplateGeneratorFactory.cs
+++ /dev/null
@@ -1,19 +0,0 @@
-using Microsoft.UI.Xaml;
-using Microsoft.UI.Xaml.Markup;
-
-namespace Hyperbar.Windows;
-
-public class TemplateGeneratorFactory :
-    ITemplateGeneratorFactory
-{
-    public DataTemplate Create()
-    {
-        string xamlString = @"
-                <DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
-                                xmlns:desktop='using:Hyperbar.Windows'>
-                    <desktop:TemplateGeneratorControl />
-                </DataTemplate>";
-
-        return (DataTemplate)XamlReader.Load(xamlString);
-    }
-}
\ No newline at end of file
diff --git a/Hyperbar.Windows/Templates/ValueConverter.cs b/Hyperbar.Windows/Templates/ValueConverter.cs
new file mode 100644
index 0000000..26513b5
--- /dev/null
+++ b/Hyperbar.Windows/Templates/ValueConverter.cs
@@ -0,0 +1,45 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Markup;
+
+namespace Hyperbar.Windows;
+
+public abstract class ValueConverter<TSource, TTarget> :
+    MarkupExtension,
+    IValueConverter
+{
+    protected override object ProvideValue(IXamlServiceProvider serviceProvider)
+    {
+        return this;
+    }
+
+    public object? Convert(object value, Type targetType, object parameter, string language)
+    {
+        return ConvertTo((TSource)value, targetType, parameter, language);
+    }
+
+    public object? ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        return ConvertBackTo((TTarget)value, targetType, parameter, language);
+    }
+
+    public TTarget? Convert(TSource value)
+    {
+        return ConvertTo(value, null, null, null);
+    }
+
+    public TSource? ConvertBack(TTarget value)
+    {
+        return ConvertBackTo(value, null, null, null);
+    }
+
+    protected virtual TTarget? ConvertTo(TSource value, Type? targetType, object? parameter, string? language)
+    {
+        return default;
+    }
+
+    protected virtual TSource? ConvertBackTo(TTarget value, Type? targetType, object? parameter, string? language)
+    {
+        return default;
+    }
+}
diff --git a/Hyperbar.Windows/Views/CommandView.xaml b/Hyperbar.Windows/Views/CommandView.xaml
index 2c804ab..c0a7e1d 100644
--- a/Hyperbar.Windows/Views/CommandView.xaml
+++ b/Hyperbar.Windows/Views/CommandView.xaml
@@ -2,8 +2,9 @@
 <UserControl
     x:Class="Hyperbar.Windows.CommandView"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <ItemsControl ItemTemplateSelector="{Binding TemplateFactory}" ItemsSource="{Binding}">
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:windows="using:Hyperbar.Windows">
+    <ItemsControl ItemTemplateSelector="{Binding Mode=TwoWay, Converter={windows:DataTemplateConverter}}" ItemsSource="{Binding}">
         <ItemsControl.ItemsPanel>
             <ItemsPanelTemplate>
                 <StackPanel Orientation="Horizontal" />
diff --git a/Hyperbar.Windows/Views/CommandViewModel.cs b/Hyperbar.Windows/Views/CommandViewModel.cs
index 3319c1a..204c2ba 100644
--- a/Hyperbar.Windows/Views/CommandViewModel.cs
+++ b/Hyperbar.Windows/Views/CommandViewModel.cs
@@ -6,8 +6,9 @@ public partial class CommandViewModel :
     ITemplatedViewModel
 {
     public CommandViewModel(ITemplateFactory templateFactory, 
-        IServiceFactory serviceFactory, 
-        IEnumerable<IWidgetViewModel> items) : base(serviceFactory, items)
+        IServiceFactory serviceFactory,
+        IMediator mediator,
+        IEnumerable<IWidgetViewModel> items) : base(serviceFactory, mediator, items)
     {
         TemplateFactory = templateFactory;
     }
diff --git a/Hyperbar.Windows/Views/WidgetView.xaml b/Hyperbar.Windows/Views/WidgetView.xaml
index 5baccbc..50d8e68 100644
--- a/Hyperbar.Windows/Views/WidgetView.xaml
+++ b/Hyperbar.Windows/Views/WidgetView.xaml
@@ -2,8 +2,9 @@
 <UserControl
     x:Class="Hyperbar.Windows.WidgetView"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <ItemsControl ItemTemplateSelector="{Binding TemplateFactory}" ItemsSource="{Binding}">
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:windows="using:Hyperbar.Windows">
+    <ItemsControl ItemTemplateSelector="{Binding Mode=TwoWay, Converter={windows:DataTemplateConverter}}" ItemsSource="{Binding}">
         <ItemsControl.ItemsPanel>
             <ItemsPanelTemplate>
                 <StackPanel Orientation="Horizontal" Spacing="8" />
diff --git a/Hyperbar/Configuration/ConfigurationChanged.cs b/Hyperbar/Configuration/ConfigurationChanged.cs
new file mode 100644
index 0000000..a670958
--- /dev/null
+++ b/Hyperbar/Configuration/ConfigurationChanged.cs
@@ -0,0 +1,5 @@
+namespace Hyperbar;
+
+public record ConfigurationChanged<TConfiguration>(TConfiguration Configuration) : INotification 
+    where TConfiguration : 
+    class;
diff --git a/Hyperbar/Configuration/ConfigurationInitializer.cs b/Hyperbar/Configuration/ConfigurationInitializer.cs
index 246ae05..956414a 100644
--- a/Hyperbar/Configuration/ConfigurationInitializer.cs
+++ b/Hyperbar/Configuration/ConfigurationInitializer.cs
@@ -1,13 +1,7 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.Options;
-using System.Threading;
+using Microsoft.Extensions.Options;
 
 namespace Hyperbar;
 
-public record ConfigurationChanged<TConfiguration>(TConfiguration Configuration) : INotification 
-    where TConfiguration : 
-    class;
-
 public class ConfigurationInitializer<TConfiguration>(DefaultConfiguration<TConfiguration> defaults,
     IConfigurationWriter<TConfiguration> writer,
     IOptionsMonitor<TConfiguration> options,
@@ -17,12 +11,16 @@ public class ConfigurationInitializer<TConfiguration>(DefaultConfiguration<TConf
 {
     public Task InitializeAsync()
     {
-        options.OnChange(args =>
+        options.OnChange(async args =>
         {
-            mediator.PublishAsync(new ConfigurationChanged<TConfiguration>(args));
+            await mediator.PublishAsync(new ConfigurationChanged<TConfiguration>(args));
         });
 
-        writer.Write(defaults.Configuration);
+        if (defaults.Configuration is not null)
+        {
+            writer.Write(defaults.Configuration);
+        }
+
         return Task.CompletedTask;
     }
 }
diff --git a/Hyperbar/Configuration/DefaultConfiguration.cs b/Hyperbar/Configuration/DefaultConfiguration.cs
index f35f8b1..27006af 100644
--- a/Hyperbar/Configuration/DefaultConfiguration.cs
+++ b/Hyperbar/Configuration/DefaultConfiguration.cs
@@ -1,6 +1,8 @@
 namespace Hyperbar;
 
-public class DefaultConfiguration<TConfiguration>(TConfiguration configuration)
+public class DefaultConfiguration<TConfiguration>(TConfiguration? configuration = null) 
+    where TConfiguration :
+    class
 {
-    public TConfiguration Configuration => configuration;
+    public TConfiguration? Configuration => configuration;
 }
diff --git a/Hyperbar/Extensions/IServiceCollectionExtensions.cs b/Hyperbar/Extensions/IServiceCollectionExtensions.cs
index 2cc0020..ca93bf6 100644
--- a/Hyperbar/Extensions/IServiceCollectionExtensions.cs
+++ b/Hyperbar/Extensions/IServiceCollectionExtensions.cs
@@ -21,7 +21,7 @@ public static class IServiceCollectionExtensions
             {
                 Type notificationType = arguments[0];
 
-                services.TryAdd(new ServiceDescriptor(typeof(THandler), typeof(THandler), ServiceLifetime.Singleton));
+                services.TryAdd(new ServiceDescriptor(typeof(THandler), typeof(THandler), lifetime));
                 services.Add(new ServiceDescriptor(typeof(INotificationHandler<>).MakeGenericType(notificationType),
                     provider => provider.GetRequiredService<THandler>(), lifetime));
             }
@@ -53,13 +53,24 @@ public static class IServiceCollectionExtensions
                 Type responseType = arguments[1];
 
                 services.AddTransient(typeof(THandler));
-                services.AddTransient(responseType, provider => ((dynamic)provider.GetRequiredService<THandler>()).Map());
+                services.AddTransient(responseType, provider =>
+                {
+                    return ((dynamic)provider.GetRequiredService<THandler>()).Handle();
+                });
             }
         }
 
         return services;
     }
 
+    public static IServiceCollection AddConfiguration<TConfiguration>(this IServiceCollection services,
+        IConfiguration configuration)
+        where TConfiguration :
+        class, new()
+    {
+        return services.AddConfiguration<TConfiguration>(configuration, typeof(TConfiguration).Name, "Settings.json", null);
+    }
+
     public static IServiceCollection AddConfiguration<TConfiguration>(this IServiceCollection services,
         IConfiguration configuration,
         TConfiguration? defaults = null)
@@ -107,10 +118,11 @@ public static class IServiceCollectionExtensions
 
         if (defaults is not null)
         {
-            services.AddTransient(provider => new DefaultConfiguration<TConfiguration>(defaults));
-            services.AddTransient<IInitializer, ConfigurationInitializer<TConfiguration>>();
         }
 
+        services.AddTransient(provider => new DefaultConfiguration<TConfiguration>(defaults));
+        services.AddTransient<IInitializer, ConfigurationInitializer<TConfiguration>>();
+
         services.AddTransient<IWritableConfiguration<TConfiguration>, WritableConfiguration<TConfiguration>>();
         return services;
     }
diff --git a/Hyperbar/Mediators/IMappingHandler.cs b/Hyperbar/Mediators/IMappingHandler.cs
index b3f0a5c..2b39e8f 100644
--- a/Hyperbar/Mediators/IMappingHandler.cs
+++ b/Hyperbar/Mediators/IMappingHandler.cs
@@ -2,5 +2,5 @@
 
 public interface IMappingHandler<TFrom, TTo> : IHandler 
 {
-    TTo Map();
+    TTo Handle();
 }
\ No newline at end of file
diff --git a/Hyperbar/Mediators/INotificationHandler.cs b/Hyperbar/Mediators/INotificationHandler.cs
index 61e1d51..346d75b 100644
--- a/Hyperbar/Mediators/INotificationHandler.cs
+++ b/Hyperbar/Mediators/INotificationHandler.cs
@@ -1,6 +1,7 @@
 namespace Hyperbar;
 
-public interface INotificationHandler<in TNotification>
+public interface INotificationHandler<in TNotification> :
+    IHandler
     where TNotification :
     INotification
 {
diff --git a/Hyperbar/Mediators/Mediator.cs b/Hyperbar/Mediators/Mediator.cs
index ca996b5..1ae56d0 100644
--- a/Hyperbar/Mediators/Mediator.cs
+++ b/Hyperbar/Mediators/Mediator.cs
@@ -6,9 +6,9 @@ namespace Hyperbar;
 public class Mediator(IServiceProvider provider) :
     IMediator
 {
-    private readonly ConditionalWeakTable<Type, dynamic> handlers = [];
+    private readonly ConditionalWeakTable<Type, dynamic> addedHandlers = [];
 
-    public ValueTask PublishAsync<TNotification>(TNotification notification,
+    public async ValueTask PublishAsync<TNotification>(TNotification notification,
         CancellationToken cancellationToken = default)
         where TNotification :
         INotification
@@ -16,7 +16,7 @@ public class Mediator(IServiceProvider provider) :
         List<INotificationHandler<TNotification>> handlers =
             provider.GetServices<INotificationHandler<TNotification>>().ToList();
 
-        foreach (KeyValuePair<Type, dynamic> handler in this.handlers)
+        foreach (KeyValuePair<Type, dynamic> handler in addedHandlers)
         {
             if (handler.Key == typeof(TNotification))
             {
@@ -26,14 +26,12 @@ public class Mediator(IServiceProvider provider) :
 
         if (handlers.Count == 0)
         {
-            return default;
         }
         else if (handlers.Count == 1)
         {
-            return handlers[0].Handle(notification, cancellationToken);
+            await handlers[0].Handle(notification, cancellationToken);
         }
 
-        return default;
     }
 
     public ValueTask<TResponse> SendAsync<TResponse>(IRequest<TResponse> request,
@@ -82,7 +80,7 @@ public class Mediator(IServiceProvider provider) :
                 if (interfaceType.GetGenericArguments() is { Length: 1 } arguments)
                 {
                     Type notificationType = arguments[0];
-                    handlers.Add(notificationType, subject);
+                    addedHandlers.Add(notificationType, subject);
                 }
             }
         }
diff --git a/Hyperbar/Views/CollectionChanged.cs b/Hyperbar/Views/CollectionChanged.cs
new file mode 100644
index 0000000..f6cd378
--- /dev/null
+++ b/Hyperbar/Views/CollectionChanged.cs
@@ -0,0 +1,5 @@
+using System.Collections;
+
+namespace Hyperbar;
+
+public record CollectionChanged<TCollection>(TCollection Items) : INotification where TCollection : IEnumerable;
diff --git a/Hyperbar/Views/ObservableCollectionViewModel.cs b/Hyperbar/Views/ObservableCollectionViewModel.cs
index cb255f0..9ff237e 100644
--- a/Hyperbar/Views/ObservableCollectionViewModel.cs
+++ b/Hyperbar/Views/ObservableCollectionViewModel.cs
@@ -3,19 +3,29 @@
 namespace Hyperbar;
 
 public class ObservableCollectionViewModel<TItem> :
-    ObservableCollection<TItem>
+    ObservableCollection<TItem>,
+    INotificationHandler<CollectionChanged<IEnumerable<TItem>>>
 {
     private readonly IServiceFactory serviceFactory;
-
-    public ObservableCollectionViewModel(IServiceFactory serviceFactory)
+    private SynchronizationContext? context;
+    public ObservableCollectionViewModel(IServiceFactory serviceFactory, 
+        IMediator mediator)
     {
+        context = SynchronizationContext.Current;
+
         this.serviceFactory = serviceFactory;
+        mediator.Subscribe(this);
     }
 
-    public ObservableCollectionViewModel(IServiceFactory serviceFactory, 
+    public ObservableCollectionViewModel(IServiceFactory serviceFactory,
+        IMediator mediator,
         IEnumerable<TItem> items)
     {
+        context = SynchronizationContext.Current;
+
         this.serviceFactory = serviceFactory;
+        mediator.Subscribe(this);
+
         AddRange(items);
     }
 
@@ -31,7 +41,7 @@ public class ObservableCollectionViewModel<TItem> :
         where T : TItem
     {
         T? item = serviceFactory.Create<T>(parameters);
-        Add(item);
+        context?.Post(state => Add(item), null);
 
         return item;
     }
@@ -41,7 +51,7 @@ public class ObservableCollectionViewModel<TItem> :
         TItem
     {
         T? item = serviceFactory.Create<T>();
-        Add(item);
+        context?.Post(state => Add(item), null);
 
         return item;
     }
@@ -50,12 +60,19 @@ public class ObservableCollectionViewModel<TItem> :
     {
         foreach (TItem? item in items)
         {
-            Add(item);
+            context?.Post(state => Add(item), null);
         }
     }
+
+    public ValueTask Handle(CollectionChanged<IEnumerable<TItem>> notification, 
+        CancellationToken cancellationToken)
+    {
+        context?.Post(state => Clear(), null);
+        AddRange(notification.Items);
+
+        return ValueTask.CompletedTask;
+    }
 }
 
-public class ObservableCollectionViewModel(IServiceFactory serviceFactory) :
-    ObservableCollectionViewModel<object>(serviceFactory)
-{
-}
\ No newline at end of file
+public class ObservableCollectionViewModel(IServiceFactory serviceFactory, IMediator mediator) :
+    ObservableCollectionViewModel<object>(serviceFactory, mediator);
\ No newline at end of file