completed the missing code

src/Shared/HandyControlDemo_Shared/App.xaml.cs

@@ -71,6 +71,8 @@ namespace HandyControlDemo
                 }
 
                 ConfigHelper.Instance.SetSystemVersionInfo(CommonHelper.GetSystemVersionInfo());
+                ConfigHelper.Instance.SetWindowDefaultStyle();
+                ConfigHelper.Instance.SetNavigationWindowDefaultStyle();
 
                 ServicePointManager.SecurityProtocol = (SecurityProtocolType)(SslProtocols)0x00000C00;
             }

src/Shared/HandyControl_Shared/Controls/Attach/MenuTopLineAttach.cs

@@ -21,8 +21,19 @@ namespace HandyControl.Controls
                 if (popup.TemplatedParent is MenuItem menuItem)
                 {
                     SetTopLine(menuItem, topLine);
-                    menuItem.Unloaded += MenuItem_Unloaded;
-                } 
+                    menuItem.Loaded += MenuItem_Loaded;
+                }
+            }
+        }
+
+        private static void MenuItem_Loaded(object sender, RoutedEventArgs e)
+        {
+            var menuItem = (FrameworkElement)sender;
+            menuItem.Unloaded += MenuItem_Unloaded;
+            var topLine = GetTopLine(menuItem);
+            var popup = GetPopup(topLine);
+            if (popup != null)
+            {
                 popup.Opened += Popup_Opened;
             }
         }

src/Shared/HandyControl_Shared/Themes/Styles/Base/ContextMenuBaseStyle.xaml

@@ -2,6 +2,7 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
 
     <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="../../Basic/Effects.xaml"/>
         <ResourceDictionary Source="../ScrollViewer.xaml"/>
     </ResourceDictionary.MergedDictionaries>
 
@@ -11,7 +12,7 @@
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="ContextMenu">
-                    <Border Background="{TemplateBinding Background}" CornerRadius="2" MaxHeight="{TemplateBinding MaxHeight}" BorderThickness="1" BorderBrush="{DynamicResource BorderBrush}">
+                    <Border Effect="{StaticResource EffectShadow2}" Margin="8" Background="{TemplateBinding Background}" CornerRadius="2" MaxHeight="{TemplateBinding MaxHeight}" BorderThickness="1" BorderBrush="{DynamicResource BorderBrush}">
                         <ScrollViewer Style="{StaticResource ScrollViewerUpDown}"  Margin="0,6">
                             <ItemsPresenter/>
                         </ScrollViewer>

src/Shared/HandyControl_Shared/Themes/Styles/Base/MenuBaseStyle.xaml

@@ -167,7 +167,7 @@
                                     <ContentPresenter TextElement.Foreground="{TemplateBinding Foreground}" Margin="0,3" x:Name="ContentPresenter" ContentTemplate="{TemplateBinding HeaderTemplate}" Grid.Column="1" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                     <Path x:Name="Path" Grid.Column="4" Width="10" Height="10" HorizontalAlignment="Left" Data="{StaticResource RightGeometry}" Stretch="Uniform" Fill="{TemplateBinding Foreground}" VerticalAlignment="Center"/>
                                     <Popup Grid.Column="1" x:Name="PART_Popup" AllowsTransparency="True" Focusable="False" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" Placement="Right" VerticalOffset="-13" HorizontalOffset="10">
-                                        <Border CornerRadius="2" x:Name="SubMenuBorder" BorderThickness="1" BorderBrush="{DynamicResource BorderBrush}" Background="{DynamicResource RegionBrush}">
+                                        <Border Effect="{StaticResource EffectShadow2}" Margin="8" CornerRadius="2" x:Name="SubMenuBorder" BorderThickness="1" BorderBrush="{DynamicResource BorderBrush}" Background="{DynamicResource RegionBrush}">
                                             <ScrollViewer Style="{StaticResource ScrollViewerUpDown}" Margin="0,6">
                                                 <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Cycle" Grid.IsSharedSizeScope="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle"/>
                                             </ScrollViewer>
@@ -185,7 +185,7 @@
                 </Setter>
             </Trigger>
             <Trigger Property="IsHighlighted" Value="True">
-                <Setter Property="Background" Value="{DynamicResource DarkDefaultBrush}"/>
+                <Setter Property="Background" Value="{DynamicResource SecondaryRegionBrush}"/>
             </Trigger>
             <Trigger Property="IsEnabled" Value="False">
                 <Setter Property="Opacity" Value=".4"/>