diff --git a/src/Avalonia.FreeDesktop/Avalonia.FreeDesktop.csproj b/src/Avalonia.FreeDesktop/Avalonia.FreeDesktop.csproj
index 8791efd313..da9add1fa4 100644
--- a/src/Avalonia.FreeDesktop/Avalonia.FreeDesktop.csproj
+++ b/src/Avalonia.FreeDesktop/Avalonia.FreeDesktop.csproj
@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Tmds.DBus.Protocol" Version="0.14.0" />
-    <PackageReference Include="Tmds.DBus.SourceGenerator" Version="0.0.2" />
+    <PackageReference Include="Tmds.DBus.SourceGenerator" Version="0.0.4" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Avalonia.FreeDesktop/DBusMenuExporter.cs b/src/Avalonia.FreeDesktop/DBusMenuExporter.cs
index d08828f796..3073ea580c 100644
--- a/src/Avalonia.FreeDesktop/DBusMenuExporter.cs
+++ b/src/Avalonia.FreeDesktop/DBusMenuExporter.cs
@@ -60,38 +60,42 @@ namespace Avalonia.FreeDesktop
 
             public override string Path { get; }
 
-            protected override (uint revision, (int, Dictionary<string, DBusVariantItem>, DBusVariantItem[]) layout) OnGetLayout(int parentId, int recursionDepth, string[] propertyNames)
+            protected override ValueTask<(uint revision, (int, Dictionary<string, DBusVariantItem>, DBusVariantItem[]) layout)> OnGetLayoutAsync(int parentId, int recursionDepth, string[] propertyNames)
             {
                 var menu = GetMenu(parentId);
                 var layout = GetLayout(menu.item, menu.menu, recursionDepth, propertyNames);
                 if (!IsNativeMenuExported)
                 {
                     IsNativeMenuExported = true;
-                    Dispatcher.UIThread.Post(() => OnIsNativeMenuExportedChanged?.Invoke(this, EventArgs.Empty));
+                    OnIsNativeMenuExportedChanged?.Invoke(this, EventArgs.Empty);
                 }
 
-                return (_revision, layout);
+                return new ValueTask<(uint, (int, Dictionary<string, DBusVariantItem>, DBusVariantItem[]))>((_revision, layout));
             }
 
-            protected override (int, Dictionary<string, DBusVariantItem>)[] OnGetGroupProperties(int[] ids, string[] propertyNames) =>
-                ids.Select(id => (id, GetProperties(GetMenu(id), propertyNames))).ToArray();
+            protected override ValueTask<(int, Dictionary<string, DBusVariantItem>)[]> OnGetGroupPropertiesAsync(int[] ids, string[] propertyNames)
+                => new(ids.Select(id => (id, GetProperties(GetMenu(id), propertyNames))).ToArray());
 
-            protected override DBusVariantItem OnGetProperty(int id, string name) => GetProperty(GetMenu(id), name) ?? new DBusVariantItem("i", new DBusInt32Item(0));
+            protected override ValueTask<DBusVariantItem> OnGetPropertyAsync(int id, string name) =>
+                new(GetProperty(GetMenu(id), name) ?? new DBusVariantItem("i", new DBusInt32Item(0)));
 
-            protected override void OnEvent(int id, string eventId, DBusVariantItem data, uint timestamp) =>
-                Dispatcher.UIThread.Post(() => HandleEvent(id, eventId));
+            protected override ValueTask OnEventAsync(int id, string eventId, DBusVariantItem data, uint timestamp)
+            {
+                HandleEvent(id, eventId);
+                return new ValueTask();
+            }
 
-            protected override int[] OnEventGroup((int, string, DBusVariantItem, uint)[] events)
+            protected override ValueTask<int[]> OnEventGroupAsync((int, string, DBusVariantItem, uint)[] events)
             {
                 foreach (var e in events)
-                    Dispatcher.UIThread.Post(() => HandleEvent(e.Item1, e.Item2));
-                return Array.Empty<int>();
+                    HandleEvent(e.Item1, e.Item2);
+                return new ValueTask<int[]>(Array.Empty<int>());
             }
 
-            protected override bool OnAboutToShow(int id) => false;
+            protected override ValueTask<bool> OnAboutToShowAsync(int id) => new(false);
 
-            protected override (int[] updatesNeeded, int[] idErrors) OnAboutToShowGroup(int[] ids) =>
-                (Array.Empty<int>(), Array.Empty<int>());
+            protected override ValueTask<(int[] updatesNeeded, int[] idErrors)> OnAboutToShowGroupAsync(int[] ids) =>
+                new((Array.Empty<int>(), Array.Empty<int>()));
 
             private async Task InitializeAsync()
             {
diff --git a/src/Avalonia.FreeDesktop/DBusTrayIconImpl.cs b/src/Avalonia.FreeDesktop/DBusTrayIconImpl.cs
index afbee77067..fed8b87bc9 100644
--- a/src/Avalonia.FreeDesktop/DBusTrayIconImpl.cs
+++ b/src/Avalonia.FreeDesktop/DBusTrayIconImpl.cs
@@ -1,8 +1,10 @@
 using System;
 using System.Diagnostics;
+using System.Threading.Tasks;
 using Avalonia.Controls.Platform;
 using Avalonia.Logging;
 using Avalonia.Platform;
+using Avalonia.Threading;
 using Tmds.DBus.Protocol;
 using Tmds.DBus.SourceGenerator;
 
@@ -219,13 +221,6 @@ namespace Avalonia.FreeDesktop
             Connection = connection;
             BackingProperties.Menu = dbusMenuPath;
             BackingProperties.ToolTip = (string.Empty, Array.Empty<(int, int, byte[])>(), string.Empty, string.Empty);
-            BackingProperties.IconName = string.Empty;
-            BackingProperties.AttentionIconName = string.Empty;
-            BackingProperties.AttentionIconPixmap = new []{ DBusTrayIconImpl.EmptyPixmap };
-            BackingProperties.AttentionMovieName = string.Empty;
-            BackingProperties.IconThemePath = string.Empty;
-            BackingProperties.OverlayIconName = string.Empty;
-            BackingProperties.OverlayIconPixmap = new []{ DBusTrayIconImpl.EmptyPixmap };
             InvalidateAll();
         }
 
@@ -235,13 +230,17 @@ namespace Avalonia.FreeDesktop
 
         public event Action? ActivationDelegate;
 
-        protected override void OnContextMenu(int x, int y) { }
+        protected override ValueTask OnContextMenuAsync(int x, int y) => new();
 
-        protected override void OnActivate(int x, int y) => ActivationDelegate?.Invoke();
+        protected override ValueTask OnActivateAsync(int x, int y)
+        {
+            Dispatcher.UIThread.Post(() => ActivationDelegate?.Invoke());
+            return new ValueTask();
+        }
 
-        protected override void OnSecondaryActivate(int x, int y) { }
+        protected override ValueTask OnSecondaryActivateAsync(int x, int y) => new();
 
-        protected override void OnScroll(int delta, string orientation) { }
+        protected override ValueTask OnScrollAsync(int delta, string orientation) => new();
 
         public void InvalidateAll()
         {
diff --git a/src/Avalonia.Themes.Fluent/Controls/Menu.xaml b/src/Avalonia.Themes.Fluent/Controls/Menu.xaml
index 692bac958a..039482d70f 100644
--- a/src/Avalonia.Themes.Fluent/Controls/Menu.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/Menu.xaml
@@ -37,6 +37,7 @@
                    MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
                    IsLightDismissEnabled="True"
                    IsOpen="{TemplateBinding IsSubMenuOpen, Mode=TwoWay}"
+                   PlacementMode="BottomEdgeAlignedLeft"
                    OverlayInputPassThroughElement="{Binding $parent[Menu]}">
               <Border Background="{DynamicResource MenuFlyoutPresenterBackground}"
                       BorderBrush="{DynamicResource MenuFlyoutPresenterBorderBrush}"
diff --git a/src/Avalonia.Themes.Simple/Controls/Menu.xaml b/src/Avalonia.Themes.Simple/Controls/Menu.xaml
index 797aeedd23..f5e0250058 100644
--- a/src/Avalonia.Themes.Simple/Controls/Menu.xaml
+++ b/src/Avalonia.Themes.Simple/Controls/Menu.xaml
@@ -26,8 +26,8 @@
             </ContentPresenter>
             <Popup Name="PART_Popup"
                    IsLightDismissEnabled="True"
-                   IsOpen="{TemplateBinding IsSubMenuOpen,
-                                            Mode=TwoWay}"
+                   IsOpen="{TemplateBinding IsSubMenuOpen, Mode=TwoWay}"
+                   PlacementMode="BottomEdgeAlignedLeft"
                    OverlayInputPassThroughElement="{Binding $parent[Menu]}">
               <Border Background="{DynamicResource ThemeBackgroundBrush}"
                       BorderBrush="{DynamicResource ThemeBorderMidBrush}"