allow application name to be set on osx.

samples/ControlCatalog/App.xaml.cs

@@ -9,6 +9,8 @@ namespace ControlCatalog
         public override void Initialize()
         {
             AvaloniaXamlLoader.Load(this);
+
+            Name = "Avalonia";
         }
 
         public override void OnFrameworkInitializationCompleted()

src/Avalonia.Native/AvaloniaNativePlatform.cs

@@ -9,6 +9,7 @@ using Avalonia.Native.Interop;
 using Avalonia.OpenGL;
 using Avalonia.Platform;
 using Avalonia.Rendering;
+using Avalonia.Platform.Interop;
 
 namespace Avalonia.Native
 {
@@ -27,15 +28,17 @@ namespace Avalonia.Native
 
         public TimeSpan DoubleClickTime => TimeSpan.FromMilliseconds(500); //TODO
 
-        public static void Initialize(IntPtr factory, AvaloniaNativePlatformOptions options)
+        public static AvaloniaNativePlatform Initialize(IntPtr factory, AvaloniaNativePlatformOptions options)
         {
-            new AvaloniaNativePlatform(new IAvaloniaNativeFactory(factory))
-                .DoInitialize(options);
+            var result =  new AvaloniaNativePlatform(new IAvaloniaNativeFactory(factory));
+            result.DoInitialize(options);
+
+            return result;
         }
 
         delegate IntPtr CreateAvaloniaNativeDelegate();
 
-        public static void Initialize(AvaloniaNativePlatformOptions options)
+        public static AvaloniaNativePlatform Initialize(AvaloniaNativePlatformOptions options)
         {
             if (options.AvaloniaNativeLibraryPath != null)
             {
@@ -48,10 +51,21 @@ namespace Avalonia.Native
                 var d = Marshal.GetDelegateForFunctionPointer<CreateAvaloniaNativeDelegate>(proc);
 
 
-                Initialize(d(), options);
+                return Initialize(d(), options);
             }
             else
-                Initialize(CreateAvaloniaNative(), options);
+                return Initialize(CreateAvaloniaNative(), options);
+        }
+
+        public void SetupApplicationName()
+        {
+            if(!string.IsNullOrWhiteSpace(Application.Current.Name))
+            {
+                using (var buffer = new Utf8Buffer(Application.Current.Name))
+                {
+                    _factory.MacOptions.SetApplicationTitle(buffer.DangerousGetHandle());
+                }
+            }
         }
 
         private AvaloniaNativePlatform(IAvaloniaNativeFactory factory)
@@ -66,6 +80,7 @@ namespace Avalonia.Native
             if (_factory.MacOptions != null)
             {
                 var macOpts = AvaloniaLocator.Current.GetService<MacOSPlatformOptions>();
+
                 _factory.MacOptions.ShowInDock = macOpts?.ShowInDock != false ? 1 : 0;
             }
 

src/Avalonia.Native/AvaloniaNativePlatformExtensions.cs

@@ -13,9 +13,17 @@ namespace Avalonia
             where T : AppBuilderBase<T>, new()
         {
             builder.UseWindowingSubsystem(() =>
-                AvaloniaNativePlatform.Initialize(
+            {
+                var platform = AvaloniaNativePlatform.Initialize(
                     AvaloniaLocator.Current.GetService<AvaloniaNativePlatformOptions>() ??
-                    new AvaloniaNativePlatformOptions()));
+                    new AvaloniaNativePlatformOptions());
+
+                    builder.AfterSetup (x=>
+                    {
+                        platform.SetupApplicationName();
+                    });
+            });
+
             return builder;
         }
     }