diff --git a/Toolkit.Foundation/Observable.cs b/Toolkit.Foundation/Observable.cs
index 7a156cb..0a3e62d 100644
--- a/Toolkit.Foundation/Observable.cs
+++ b/Toolkit.Foundation/Observable.cs
@@ -86,21 +86,21 @@ public partial class Observable<TValue>(IServiceProvider provider,
     IMediator mediator, 
     IPublisher publisher, 
     ISubscription subscriber, 
-    IDisposer disposer) : Observable(provider, factory, mediator, publisher, subscriber, disposer)
-    where TValue : notnull
+    IDisposer disposer,
+    TValue? value = default) : Observable(provider, factory, mediator, publisher, subscriber, disposer)
 {
     [ObservableProperty]
-    private TValue? value;
+    private TValue? value = value;
 }
 
+
 public partial class Observable<TKey, TValue>(IServiceProvider provider,
     IServiceFactory factory,
     IMediator mediator,
     IPublisher publisher,
     ISubscription subscriber,
     IDisposer disposer,
-    TValue? value = null) : Observable(provider, factory, mediator, publisher, subscriber, disposer)
-    where TValue : class
+    TValue? value = default) : Observable(provider, factory, mediator, publisher, subscriber, disposer)
 {
     [ObservableProperty]
     private TKey? key;
diff --git a/Toolkit.UI.Controls.Avalonia/Fonts/FluentSystemIcons-Regular.ttf b/Toolkit.UI.Controls.Avalonia/Fonts/FluentSystemIcons-Regular.ttf
deleted file mode 100644
index b7dfdc2..0000000
Binary files a/Toolkit.UI.Controls.Avalonia/Fonts/FluentSystemIcons-Regular.ttf and /dev/null differ
diff --git a/Toolkit.UI.Controls.Avalonia/Fonts/FluentSystemIcons-Resizable.ttf b/Toolkit.UI.Controls.Avalonia/Fonts/FluentSystemIcons-Resizable.ttf
new file mode 100644
index 0000000..a3c7a18
Binary files /dev/null and b/Toolkit.UI.Controls.Avalonia/Fonts/FluentSystemIcons-Resizable.ttf differ
diff --git a/Toolkit.UI.Controls.Avalonia/Themes/ControlResources.axaml b/Toolkit.UI.Controls.Avalonia/Themes/ControlResources.axaml
index 35898a6..6617e6c 100644
--- a/Toolkit.UI.Controls.Avalonia/Themes/ControlResources.axaml
+++ b/Toolkit.UI.Controls.Avalonia/Themes/ControlResources.axaml
@@ -1,7 +1,7 @@
 <Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <Styles.Resources>
         <ResourceDictionary>
-            <FontFamily x:Key="FluentThemeFontFamily">/Fonts/#FluentSystemIcons-Regular</FontFamily>
+            <FontFamily x:Key="FluentThemeFontFamily">/Fonts/#FluentSystemIcons-Resizable</FontFamily>
             <ResourceDictionary.MergedDictionaries>
                 <MergeResourceInclude Source="../CarouselView/CarouselView.axaml" />
                 <MergeResourceInclude Source="../ContentDialog/ContentDialog.axaml" />
diff --git a/Toolkit.UI.Controls.Avalonia/Toolkit.UI.Controls.Avalonia.csproj b/Toolkit.UI.Controls.Avalonia/Toolkit.UI.Controls.Avalonia.csproj
index 70538bb..89cea21 100644
--- a/Toolkit.UI.Controls.Avalonia/Toolkit.UI.Controls.Avalonia.csproj
+++ b/Toolkit.UI.Controls.Avalonia/Toolkit.UI.Controls.Avalonia.csproj
@@ -6,10 +6,10 @@
 		<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 	</PropertyGroup>
 	<ItemGroup>
-	  <None Remove="Fonts\FluentSystemIcons-Regular.ttf" />
+	  <None Remove="Fonts\FluentSystemIcons-Resizable.ttf" />
 	</ItemGroup>
 	<ItemGroup>
-	  <AvaloniaResource Include="Fonts\FluentSystemIcons-Regular.ttf" />
+	  <AvaloniaResource Include="Fonts\FluentSystemIcons-Resizable.ttf" />
 	</ItemGroup>
 	<ItemGroup>
 		<PackageReference Include="Avalonia" Version="11.2.999-cibuild0048140-alpha" />