demo acrylic brush.

samples/ControlCatalog/MainWindow.xaml

@@ -1,5 +1,4 @@
-<Window xmlns="https://github.com/avaloniaui" MinWidth="500" MinHeight="300"
-        Width="1024" Height="800"
+<Window xmlns="https://github.com/avaloniaui" MinWidth="500" MinHeight="300"        
         xmlns:pages="clr-namespace:ControlCatalog.Pages"
         Title="Avalonia Control Gallery"
         Icon="/Assets/test_icon.ico"
@@ -10,81 +9,17 @@
         ExtendClientAreaToDecorationsHint="{Binding ExtendClientAreaEnabled}"
         ExtendClientAreaChromeHints="{Binding ChromeHints}"
         ExtendClientAreaTitleBarHeightHint="{Binding TitleBarHeight}"
-        TransparencyLevelHint="{Binding TransparencyLevel}"
+        TransparencyLevelHint="AcrylicBlur"
         x:Name="MainWindow"
+        
         x:Class="ControlCatalog.MainWindow" WindowState="{Binding WindowState, Mode=TwoWay}" Background="{x:Null}">
-  <NativeMenu.Menu>
-    <NativeMenu>
-      <NativeMenuItem Header="File">
-        <NativeMenuItem.Menu>
-          <NativeMenu>
-            <NativeMenuItem Icon="/Assets/test_icon.ico" Header="Open" Clicked="OnOpenClicked" Gesture="Ctrl+O"/>
-            <NativeMenuItemSeperator/>
-            <NativeMenuItem Icon="/Assets/github_icon.png" Header="Recent">
-              <NativeMenuItem.Menu>
-                <NativeMenu/>
-              </NativeMenuItem.Menu>
-            </NativeMenuItem>
-            <NativeMenuItemSeperator/>
-            <NativeMenuItem Header="{x:Static local:MainWindow.MenuQuitHeader}"
-                            Gesture="{x:Static local:MainWindow.MenuQuitGesture}"
-                            Clicked="OnCloseClicked" />
-          </NativeMenu>
-        </NativeMenuItem.Menu>
-      </NativeMenuItem>
-      <NativeMenuItem Header="Edit">
-        <NativeMenuItem.Menu>
-          <NativeMenu>
-            <NativeMenuItem Header="Copy"/>
-            <NativeMenuItem Header="Paste"/>
-          </NativeMenu>
-        </NativeMenuItem.Menu>
-      </NativeMenuItem>
-      <NativeMenuItem Header="Options">
-        <NativeMenuItem.Menu>
-          <NativeMenu>
-           <NativeMenuItem Header="Check Me (None)" 
-                            Command="{Binding ToggleMenuItemCheckedCommand}"
-                            ToggleType="None"
-                            IsChecked="{Binding IsMenuItemChecked}"  />
-            <NativeMenuItem Header="Check Me (CheckBox)" 
-                            Command="{Binding ToggleMenuItemCheckedCommand}"
-                            ToggleType="CheckBox"
-                            IsChecked="{Binding IsMenuItemChecked}"  />
-            <NativeMenuItem Header="Check Me (Radio)" 
-                            Command="{Binding ToggleMenuItemCheckedCommand}"
-                            ToggleType="Radio"
-                            IsChecked="{Binding IsMenuItemChecked}"  />
-          </NativeMenu>
-        </NativeMenuItem.Menu>
-      </NativeMenuItem>
-    </NativeMenu>
-  </NativeMenu.Menu>
+  <Panel DockPanel.Dock="Left" Width="400" Height="400" Background="Green">
 
-  <Window.DataTemplates>
-    <DataTemplate DataType="vm:NotificationViewModel">
-      <v:CustomNotificationView />
-    </DataTemplate>
-  </Window.DataTemplates>
-  <Panel>
-    <Panel Margin="{Binding #MainWindow.OffScreenMargin}">
-      <DockPanel LastChildFill="True" Margin="{Binding #MainWindow.WindowDecorationMargins}">
-        <Menu Name="MainMenu" DockPanel.Dock="Top">
-          <MenuItem Header="File">
-            <MenuItem Header="Exit" Command="{Binding ExitCommand}" />
-          </MenuItem>
-          <MenuItem Header="Help">
-            <MenuItem Header="About" Command="{Binding AboutCommand}" />
-          </MenuItem>
-        </Menu>
-        <local:MainView />
-      </DockPanel>
+    <Button Content="{Binding Test}" Background="Red" FontSize="55" Foreground="White" VerticalAlignment="Center" HorizontalAlignment="Center"/>
+    <Panel>
+      <Panel.Background>
+        <AcrylicBrush TintColor="Black" BackgroundSource="BackDrop" TintOpacity="0.0" TintLuminosityOpacity="0.4" />
+      </Panel.Background>
     </Panel>
-    <Border IsVisible="{Binding ExtendClientAreaEnabled}" BorderThickness="1 1 1 0" CornerRadius="4 4 0 0" BorderBrush="#55000000" Height="22" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="250 8 0 0">
-      <Border.Background>
-        <SolidColorBrush Color="White" Opacity="0.7" />
-      </Border.Background>
-      <TextBlock Margin="5 5 5 0" Text="Content In TitleBar" />
-    </Border>
   </Panel>
 </Window>

samples/ControlCatalog/MainWindow.xaml.cs

@@ -28,10 +28,10 @@ namespace ControlCatalog
             };
 
             DataContext = new MainWindowViewModel(_notificationArea);
-            _recentMenu = ((NativeMenu.GetMenu(this).Items[0] as NativeMenuItem).Menu.Items[2] as NativeMenuItem).Menu;
+            //_recentMenu = ((NativeMenu.GetMenu(this).Items[0] as NativeMenuItem).Menu.Items[2] as NativeMenuItem).Menu;
 
-            var mainMenu = this.FindControl<Menu>("MainMenu");
-            mainMenu.AttachedToVisualTree += MenuAttached;
+            //var mainMenu = this.FindControl<Menu>("MainMenu");
+            //mainMenu.AttachedToVisualTree += MenuAttached;
         }
 
         public static string MenuQuitHeader => RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? "Quit Avalonia" : "E_xit";

samples/ControlCatalog/ViewModels/MainWindowViewModel.cs

@@ -6,6 +6,7 @@ using Avalonia.Dialogs;
 using Avalonia.Platform;
 using System;
 using ReactiveUI;
+using System.Reactive.Linq;
 
 namespace ControlCatalog.ViewModels
 {
@@ -84,8 +85,24 @@ namespace ControlCatalog.ViewModels
             SystemTitleBarEnabled = true;
             SystemChromeButtonsEnabled = true;
             TitleBarHeight = -1;
+
+            Observable.Interval(TimeSpan.FromSeconds(0.05))
+                .ObserveOn(RxApp.MainThreadScheduler)
+                .Subscribe(x =>
+            {
+                Test = x.ToString();
+            });
         }
 
+        private string _test;
+
+        public string Test
+        {
+            get { return _test; }
+            set { this.RaiseAndSetIfChanged(ref _test, value); }
+        }
+
+
         private int _transparencyLevel;
 
         public int TransparencyLevel