diff --git a/src/Shared/HandyControl_Shared/Controls/Attach/MenuTopLineAttach.cs b/src/Shared/HandyControl_Shared/Controls/Attach/MenuTopLineAttach.cs
new file mode 100644
index 00000000..81be40a2
--- /dev/null
+++ b/src/Shared/HandyControl_Shared/Controls/Attach/MenuTopLineAttach.cs
@@ -0,0 +1,99 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using HandyControl.Tools;
+using HandyControl.Tools.Interop;
+
+namespace HandyControl.Controls
+{
+    public class MenuTopLineAttach
+    {
+        public static readonly DependencyProperty PopupProperty = DependencyProperty.RegisterAttached(
+            "Popup", typeof(Popup), typeof(MenuTopLineAttach), new PropertyMetadata(default(Popup), OnPopupChanged));
+
+        private static void OnPopupChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            var topLine = (FrameworkElement) d;
+
+            if (e.NewValue is Popup popup)
+            {
+                if (popup.TemplatedParent is MenuItem menuItem)
+                {
+                    SetTopLine(menuItem, topLine);
+                    menuItem.Unloaded += MenuItem_Unloaded;
+                } 
+                popup.Opened += Popup_Opened;
+            }
+        }
+
+        private static void MenuItem_Unloaded(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;
+            }
+        }
+
+        private static void Popup_Opened(object sender, EventArgs e)
+        {
+            var popup = (Popup) sender;
+            if (popup.TemplatedParent is MenuItem menuItem)
+            {
+                var topLine = GetTopLine(menuItem);
+                if (topLine == null) return;
+
+                topLine.HorizontalAlignment = HorizontalAlignment.Left;
+                topLine.Width = menuItem.ActualWidth;
+                topLine.Margin = new Thickness();
+
+                var positionLeftTop = menuItem.PointToScreen(new Point());
+                var positionRightBottom = menuItem.PointToScreen(new Point(menuItem.ActualWidth, menuItem.ActualHeight));
+                ScreenHelper.FindMonitorRectsFromPoint(InteropMethods.GetCursorPos(), out _, out var workAreaRect);
+                var panel = VisualHelper.GetParent<Panel>(topLine);
+
+                if (positionLeftTop.X < 0)
+                {
+                    
+                    topLine.Margin = new Thickness(positionLeftTop.X - panel.Margin.Left, 0, 0, 0);
+                }
+                else if (positionLeftTop.X + panel.ActualWidth > workAreaRect.Right)
+                {
+                    var overflowWidth = positionRightBottom.X - workAreaRect.Right;
+                    if (overflowWidth > 0)
+                    {
+                        topLine.Width -= overflowWidth + panel.Margin.Right;
+                    }
+                    topLine.HorizontalAlignment = HorizontalAlignment.Left;
+                    topLine.Margin = new Thickness(positionLeftTop.X + panel.ActualWidth - workAreaRect.Right + panel.Margin.Right, 0, 0, 0);
+                }
+
+                if (positionRightBottom.Y > workAreaRect.Bottom)
+                {
+                    topLine.Width = 0;
+                    topLine.HorizontalAlignment = HorizontalAlignment.Stretch;
+                    topLine.Margin = new Thickness();
+                }
+            }
+        }
+
+        public static void SetPopup(DependencyObject element, Popup value)
+            => element.SetValue(PopupProperty, value);
+
+        public static Popup GetPopup(DependencyObject element)
+            => (Popup) element.GetValue(PopupProperty);
+
+        internal static readonly DependencyProperty TopLineProperty = DependencyProperty.RegisterAttached(
+            "TopLine", typeof(FrameworkElement), typeof(MenuTopLineAttach), new PropertyMetadata(default(FrameworkElement)));
+
+        internal static void SetTopLine(DependencyObject element, FrameworkElement value)
+            => element.SetValue(TopLineProperty, value);
+
+        internal static FrameworkElement GetTopLine(DependencyObject element)
+            => (FrameworkElement) element.GetValue(TopLineProperty);
+    }
+}
diff --git a/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems b/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems
index 1ec85042..cf7a8042 100644
--- a/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems
+++ b/src/Shared/HandyControl_Shared/HandyControl_Shared.projitems
@@ -17,6 +17,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\IconElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\IconSwitchElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\InfoElement.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\MenuTopLineAttach.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\PanelElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\PasswordBoxAttach.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\RectangleAttach.cs" />
diff --git a/src/Shared/HandyControl_Shared/Themes/Styles/Base/MenuBaseStyle.xaml b/src/Shared/HandyControl_Shared/Themes/Styles/Base/MenuBaseStyle.xaml
index bd7b0652..4bc5ed76 100644
--- a/src/Shared/HandyControl_Shared/Themes/Styles/Base/MenuBaseStyle.xaml
+++ b/src/Shared/HandyControl_Shared/Themes/Styles/Base/MenuBaseStyle.xaml
@@ -3,6 +3,7 @@
                     xmlns:controls="clr-namespace:HandyControl.Controls">
 
     <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="../../Basic/Effects.xaml"/>
         <ResourceDictionary Source="../../Basic/Geometries.xaml"/>
         <ResourceDictionary Source="../ScrollViewer.xaml"/>
     </ResourceDictionary.MergedDictionaries>
@@ -64,13 +65,13 @@
                                     </Border>
                                     <ContentPresenter x:Name="menuHeaderContainer" ContentTemplate="{TemplateBinding HeaderTemplate}" Grid.Column="1" ContentStringFormat="{TemplateBinding HeaderStringFormat}" ContentSource="Header" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                     <Popup Grid.Column="0" x:Name="PART_Popup" PlacementTarget="{Binding ElementName=templateRoot}" AllowsTransparency="True" Focusable="False" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" Placement="Bottom">
-                                        <controls:SimplePanel>
+                                        <controls:SimplePanel Effect="{StaticResource EffectShadow2}" Margin="8,0,8,8">
                                             <Border CornerRadius="0,0,2,2" 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>
                                             </Border>
-                                            <Border Height="1" Background="{DynamicResource RegionBrush}" VerticalAlignment="Top" BorderThickness="1,0" BorderBrush="{DynamicResource BorderBrush}" HorizontalAlignment="Left" Width="{Binding ActualWidth,ElementName=templateRoot}"/>
+                                            <Border controls:MenuTopLineAttach.Popup="{Binding ElementName=PART_Popup}" Height="1" Background="{DynamicResource RegionBrush}" VerticalAlignment="Top" BorderThickness="1,0" BorderBrush="{DynamicResource BorderBrush}" HorizontalAlignment="Left"/>
                                         </controls:SimplePanel>
                                     </Popup>
                                 </Grid>
diff --git a/src/Shared/HandyControl_Shared/Tools/Converter/TreeViewItemMarginConverter.cs b/src/Shared/HandyControl_Shared/Tools/Converter/TreeViewItemMarginConverter.cs
index b8872602..a6bbd3e7 100644
--- a/src/Shared/HandyControl_Shared/Tools/Converter/TreeViewItemMarginConverter.cs
+++ b/src/Shared/HandyControl_Shared/Tools/Converter/TreeViewItemMarginConverter.cs
@@ -8,7 +8,6 @@ namespace HandyControl.Tools.Converter
 {
     public class TreeViewItemMarginConverter: IValueConverter
     {
-
         public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
         {
             var left = 0.0;
diff --git a/src/Shared/HandyControl_Shared/Tools/Helper/VisualHelper.cs b/src/Shared/HandyControl_Shared/Tools/Helper/VisualHelper.cs
index b6351478..84a088e1 100644
--- a/src/Shared/HandyControl_Shared/Tools/Helper/VisualHelper.cs
+++ b/src/Shared/HandyControl_Shared/Tools/Helper/VisualHelper.cs
@@ -20,12 +20,10 @@ namespace HandyControl.Tools
                 .FirstOrDefault(group => string.CompareOrdinal(groupName, group.Name) == 0);
         }
 
-        internal static FrameworkElement GetImplementationRoot(DependencyObject d)
-        {
-            return 1 == VisualTreeHelper.GetChildrenCount(d)
+        internal static FrameworkElement GetImplementationRoot(DependencyObject d) =>
+            1 == VisualTreeHelper.GetChildrenCount(d)
                 ? VisualTreeHelper.GetChild(d, 0) as FrameworkElement
                 : null;
-        }
 
         public static T GetChild<T>(DependencyObject d) where T : DependencyObject
         {
@@ -42,16 +40,19 @@ namespace HandyControl.Tools
             return default;
         }
 
-        public static IntPtr GetHandle(this Visual visual)
-        {
-            return (PresentationSource.FromVisual(visual) as HwndSource)?.Handle ?? IntPtr.Zero;
-        }
+        public static T GetParent<T>(DependencyObject d) where T : DependencyObject =>
+            d switch
+            {
+                null => default,
+                T t => t,
+                Window _ => null,
+                _ => GetParent<T>(VisualTreeHelper.GetParent(d))
+            };
 
-        internal static void HitTestVisibleElements(Visual visual, HitTestResultCallback resultCallback,
-            HitTestParameters parameters)
-        {
+        public static IntPtr GetHandle(this Visual visual) => (PresentationSource.FromVisual(visual) as HwndSource)?.Handle ?? IntPtr.Zero;
+
+        internal static void HitTestVisibleElements(Visual visual, HitTestResultCallback resultCallback, HitTestParameters parameters) =>
             VisualTreeHelper.HitTest(visual, ExcludeNonVisualElements, resultCallback, parameters);
-        }
 
         private static HitTestFilterBehavior ExcludeNonVisualElements(DependencyObject potentialHitTestTarget)
         {