feat: move to menu.

demo/Ursa.Demo/Converters/MenuDataTemplateSelector.cs

@@ -11,12 +11,11 @@ public class MenuDataTemplateSelector: IDataTemplate
     
     public Control? Build(object? param)
     {
-        if (param is NavigationMenuItemViewModel vm)
+        if (param is MenuItemViewModel vm)
         {
             if (vm.IsSeparator) return SeparatorTemplate?.Build(vm);
             else return MenuTemplate?.Build(vm);
         }
-
         return null;
     }
 

demo/Ursa.Demo/Converters/ViewLocator.cs

@@ -0,0 +1,29 @@
+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using Ursa.Demo.Pages;
+
+namespace Ursa.Demo.Converters;
+
+public class ViewLocator: IDataTemplate
+{
+    public Control? Build(object? param)
+    {
+        if (param is null) return null;
+        var name = param.GetType().Name!.Replace("ViewModel", "");
+        var type = Type.GetType("Ursa.Demo.Pages."+name);
+        if (type != null)
+        {
+            return (Control)Activator.CreateInstance(type)!;
+        }
+        else
+        {
+            return new TextBlock { Text = "Not Found: " + name };
+        }
+    }
+
+    public bool Match(object? data)
+    {
+        return true;
+    }
+}

demo/Ursa.Demo/Models/MenuKeys.cs

@@ -0,0 +1,15 @@
+namespace Ursa.Demo;
+
+public static class MenuKeys
+{
+    public const string MenuKeyBadge = "Badge";
+    public const string MenuKeyBanner = "Banner";
+    public const string MenuKeyButtonGroup = "ButtonGroup";
+    public const string MenuKeyDivider = "Divider";
+    public const string MenuKeyIpBox = "IPv4Box";
+    public const string MenuKeyLoading = "Loading";
+    public const string MenuKeyNavigation = "Navigation";
+    public const string MenuKeyPagination = "Pagination";
+    public const string MenuKeyTagInput = "TagInput";
+    public const string MenuKeyTimeline = "Timeline";
+}

demo/Ursa.Demo/Pages/ButtonGroupDemo.axaml

@@ -9,7 +9,7 @@
     d:DesignHeight="450"
     d:DesignWidth="800"
     x:CompileBindings="True"
-    x:DataType="vm:ButtonGroupViewModel"
+    x:DataType="vm:ButtonGroupDemoViewModel"
     mc:Ignorable="d">
 
     <StackPanel Margin="20" Spacing="20">

demo/Ursa.Demo/Pages/ButtonGroupDemo.axaml.cs

@@ -10,6 +10,6 @@ public partial class ButtonGroupDemo : UserControl
     public ButtonGroupDemo()
     {
         InitializeComponent();
-        this.DataContext = new ButtonGroupViewModel();
+        this.DataContext = new ButtonGroupDemoViewModel();
     }
 }

demo/Ursa.Demo/Pages/NavigationMenuDemo.axaml

@@ -42,7 +42,7 @@
                 <u:NavigationMenu.ItemTemplate>
                     <converters:MenuDataTemplateSelector>
                         <converters:MenuDataTemplateSelector.MenuTemplate>
-                            <DataTemplate DataType="vm:NavigationMenuItemViewModel">
+                            <DataTemplate DataType="vm:MenuItemViewModel">
                                 <u:NavigationMenuItem Header="{Binding MenuHeader}" ItemsSource="{Binding Children}">
                                     <u:NavigationMenuItem.Icon>
                                         <PathIcon
@@ -54,7 +54,7 @@
                             </DataTemplate>
                         </converters:MenuDataTemplateSelector.MenuTemplate>
                         <converters:MenuDataTemplateSelector.SeparatorTemplate>
-                            <DataTemplate DataType="vm:NavigationMenuItemViewModel">
+                            <DataTemplate DataType="vm:MenuItemViewModel">
                                 <u:NavigationMenuSeparator Header="{Binding MenuHeader}" />
                             </DataTemplate>
                         </converters:MenuDataTemplateSelector.SeparatorTemplate>

demo/Ursa.Demo/Ursa.Demo.csproj

@@ -9,7 +9,6 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <Folder Include="Models\" />
         <AvaloniaResource Include="Assets\**" />
         <None Remove=".gitignore" />
     </ItemGroup>

demo/Ursa.Demo/ViewModels/BadgeDemoViewModel.cs

@@ -0,0 +1,6 @@
+namespace Ursa.Demo.ViewModels;
+
+public class BadgeDemoViewModel: ViewModelBase
+{
+    
+}

demo/Ursa.Demo/ViewModels/BannerDemoViewModel.cs

@@ -0,0 +1,6 @@
+namespace Ursa.Demo.ViewModels;
+
+public class BannerDemoViewModel: ViewModelBase
+{
+    
+}

demo/Ursa.Demo/ViewModels/ButtonGroupDemoViewModel.cs

@@ -2,9 +2,9 @@ using System.Collections.ObjectModel;
 
 namespace Ursa.Demo.ViewModels;
 
-public class ButtonGroupViewModel: ViewModelBase
+public class ButtonGroupDemoViewModel: ViewModelBase
 {
-    public ObservableCollection<string> Items { get; set; } = new ObservableCollection<string>()
+    public ObservableCollection<string> Items { get; set; } = new ()
     {
         "Ding", "Otter", "Husky", "Mr. 17", "Cass"
     };

demo/Ursa.Demo/ViewModels/DividerDemoViewModel.cs

@@ -0,0 +1,6 @@
+namespace Ursa.Demo.ViewModels;
+
+public class DividerDemoViewModel: ViewModelBase
+{
+    
+}

demo/Ursa.Demo/ViewModels/IPv4BoxDemoViewModel.cs

@@ -0,0 +1,6 @@
+namespace Ursa.Demo.ViewModels;
+
+public class IPv4BoxDemoViewModel: ViewModelBase
+{
+    
+}

demo/Ursa.Demo/ViewModels/LoadingDemoViewModel.cs

@@ -0,0 +1,6 @@
+namespace Ursa.Demo.ViewModels;
+
+public class LoadingDemoViewModel: ViewModelBase
+{
+    
+}

demo/Ursa.Demo/ViewModels/MainWindowViewModel.cs

@@ -1,6 +1,40 @@
-namespace Ursa.Demo.ViewModels;
+
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace Ursa.Demo.ViewModels;
 
 public class MainWindowViewModel : ViewModelBase
 {
-    public string Greeting => "Welcome to Avalonia!";
+    public MenuViewModel Menus { get; set; } = new MenuViewModel();
+
+    private object? _content;
+    public object? Content
+    {
+        get => _content;
+        set => SetProperty(ref _content, value);
+    }
+
+    public MainWindowViewModel()
+    {
+        WeakReferenceMessenger.Default.Register<MainWindowViewModel, string>(this, OnNavigation);
+    }
+    
+    
+
+    private void OnNavigation(MainWindowViewModel vm, string s)
+    {
+        Content = s switch
+        {
+            MenuKeys.MenuKeyBadge => new BadgeDemoViewModel(),
+            MenuKeys.MenuKeyBanner => new BannerDemoViewModel(),
+            MenuKeys.MenuKeyButtonGroup => new ButtonGroupDemoViewModel(),
+            MenuKeys.MenuKeyDivider => new DividerDemoViewModel(),
+            MenuKeys.MenuKeyIpBox => new IPv4BoxDemoViewModel(),
+            MenuKeys.MenuKeyLoading => new LoadingDemoViewModel(),
+            MenuKeys.MenuKeyNavigation => new NavigationMenuDemoViewModel(),
+            MenuKeys.MenuKeyPagination => new PaginationDemoViewModel(),
+            MenuKeys.MenuKeyTagInput => new TagInputDemoViewModel(),
+            MenuKeys.MenuKeyTimeline => new TimelineDemoViewModel(),
+        };
+    }
 }

demo/Ursa.Demo/ViewModels/MenuItemViewModel.cs

@@ -0,0 +1,29 @@
+using System.Collections.ObjectModel;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace Ursa.Demo.ViewModels;
+
+public class MenuItemViewModel: ViewModelBase
+{
+    public string MenuHeader { get; set; }
+    public string MenuIconName { get; set; }
+    public string Key { get; set; }
+    
+    public bool IsSeparator { get; set; }
+    public ObservableCollection<MenuItemViewModel> Children { get; set; } = new();
+    
+    public ICommand ActivateCommand { get; set; }
+
+    public MenuItemViewModel()
+    {
+        ActivateCommand = new RelayCommand(OnActivate);
+    }
+
+    private void OnActivate()
+    {
+        if (IsSeparator) return;
+        WeakReferenceMessenger.Default.Send<string>(Key);
+    }
+}

demo/Ursa.Demo/ViewModels/MenuViewModel.cs

@@ -0,0 +1,26 @@
+using System.Collections.ObjectModel;
+
+namespace Ursa.Demo.ViewModels;
+
+public class MenuViewModel: ViewModelBase
+{
+    public ObservableCollection<MenuItemViewModel> MenuItems { get; set; }
+
+    public MenuViewModel()
+    {
+        MenuItems = new ObservableCollection<MenuItemViewModel>()
+        {
+            new() { MenuHeader = "Controls", IsSeparator = true },
+            new() { MenuHeader = "Badge", Key = MenuKeys.MenuKeyBadge },
+            new() { MenuHeader = "Banner", Key = MenuKeys.MenuKeyBanner },
+            new() { MenuHeader = "ButtonGroup", Key = MenuKeys.MenuKeyButtonGroup },
+            new() { MenuHeader = "Divider", Key = MenuKeys.MenuKeyDivider },
+            new() { MenuHeader = "IPv4Box", Key = MenuKeys.MenuKeyIpBox },
+            new() { MenuHeader = "Loading", Key = MenuKeys.MenuKeyLoading },
+            new() { MenuHeader = "Navigation", Key = MenuKeys.MenuKeyNavigation },
+            new() { MenuHeader = "Pagination", Key = MenuKeys.MenuKeyPagination },
+            new() { MenuHeader = "TagInput", Key = MenuKeys.MenuKeyTagInput },
+            new() { MenuHeader = "Timeline", Key = MenuKeys.MenuKeyTimeline },
+        };
+    }
+}

demo/Ursa.Demo/ViewModels/NavigationMenuDemoViewModel.cs

@@ -5,18 +5,18 @@ namespace Ursa.Demo.ViewModels;
 
 public class NavigationMenuDemoViewModel: ObservableObject
 {
-    public ObservableCollection<NavigationMenuItemViewModel> MenuItems { get; set; } = new()
+    public ObservableCollection<MenuItemViewModel> MenuItems { get; set; } = new()
     {
-        new NavigationMenuItemViewModel()
+        new MenuItemViewModel()
         {
             MenuHeader = "任务管理",
             MenuIconName = "User",
-            Children = new ObservableCollection<NavigationMenuItemViewModel>()
+            Children = new ObservableCollection<MenuItemViewModel>()
             {
                 new (){
                     MenuHeader = "公告管理" , 
                     MenuIconName = "Star",
-                    Children = new ObservableCollection<NavigationMenuItemViewModel>()
+                    Children = new ObservableCollection<MenuItemViewModel>()
                     {
                         new () {MenuHeader = "公告设置"},
                         new () {MenuHeader = "公告处理"}
@@ -24,16 +24,16 @@ public class NavigationMenuDemoViewModel: ObservableObject
                 new (){MenuHeader = "任务查询"}
             }
         },
-        new NavigationMenuItemViewModel()
+        new MenuItemViewModel()
         {
             MenuHeader = "附加功能",
             IsSeparator = true,
         },
-        new NavigationMenuItemViewModel()
+        new MenuItemViewModel()
         {
             MenuHeader = "任务平台",
             MenuIconName = "Gear",
-            Children = new ObservableCollection<NavigationMenuItemViewModel>()
+            Children = new ObservableCollection<MenuItemViewModel>()
             {
                 new (){MenuHeader = "任务管理"},
                 new (){MenuHeader = "用户任务查询"}
@@ -42,11 +42,3 @@ public class NavigationMenuDemoViewModel: ObservableObject
     };
 }
 
-public class NavigationMenuItemViewModel: ObservableObject
-{
-    public string MenuHeader { get; set; }
-    public string MenuIconName { get; set; }
-    
-    public bool IsSeparator { get; set; }
-    public ObservableCollection<NavigationMenuItemViewModel> Children { get; set; } = new();
-}

demo/Ursa.Demo/ViewModels/PaginationDemoViewModel.cs

@@ -5,7 +5,7 @@ using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace Ursa.Demo.ViewModels;
 
-public class PaginationDemoViewModel: ObservableObject
+public class PaginationDemoViewModel: ViewModelBase
 {
     public AvaloniaList<int> PageSizes { get; set; } = new() { 10, 20, 50, 100 };
 }

demo/Ursa.Demo/ViewModels/TagInputDemoViewModel.cs

@@ -0,0 +1,6 @@
+namespace Ursa.Demo.ViewModels;
+
+public class TagInputDemoViewModel: ViewModelBase
+{
+    
+}

demo/Ursa.Demo/ViewModels/TimelineDemoViewModel.cs

@@ -4,7 +4,7 @@ using Ursa.Controls;
 
 namespace Ursa.Demo.ViewModels;
 
-public class TimelineDemoViewModel: ObservableObject
+public class TimelineDemoViewModel: ViewModelBase
 {
     public TimelineItemViewModel[] Items { get; } =
     {
@@ -46,62 +46,6 @@ public class TimelineDemoViewModel: ObservableObject
             Description = "Item 5",
             Content = "Content 5"
         },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 6",
-            Content = "Content 6"
-        },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 7",
-            Content = "Content 71231"
-        },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 8",
-            Content = "Content 8123123"
-        },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 9",
-            Content = "Content 9123123"
-        },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 10",
-            Content = "Content 1231231231231231231230"
-        },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 11",
-            Content = "Content 11231231"
-        },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 12",
-            Content = "Content 12123123123123"
-        },
-        new()
-        {
-            Time = DateTime.Now,
-            TimeFormat = "HH:mm:ss",
-            Description = "Item 13",
-            Content = "Last"
-        }
     };
 }
 

demo/Ursa.Demo/Views/MainWindow.axaml

@@ -2,13 +2,17 @@
     x:Class="Ursa.Demo.Views.MainWindow"
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:converters="clr-namespace:Ursa.Demo.Converters"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:pages="clr-namespace:Ursa.Demo.Pages"
+    xmlns:u="https://irihi.tech/ursa"
     xmlns:vm="using:Ursa.Demo.ViewModels"
     Title="Ursa.Demo"
     d:DesignHeight="450"
     d:DesignWidth="800"
+    x:CompileBindings="True"
+    x:DataType="vm:MainWindowViewModel"
     Icon="/Assets/Ursa.ico"
     mc:Ignorable="d">
 
@@ -16,44 +20,67 @@
         <vm:MainWindowViewModel />
     </Design.DataContext>
 
-    <Grid RowDefinitions="Auto, *">
+    <Grid ColumnDefinitions="Auto, *" RowDefinitions="Auto, *">
+        <Border
+            Grid.RowSpan="2"
+            Padding="8,4"
+            VerticalAlignment="Stretch"
+            Theme="{DynamicResource CardBorder}">
+            <u:NavigationMenu ItemsSource="{Binding Menus.MenuItems}" ShowCollapseButton="True">
+                <u:NavigationMenu.Header>
+                    <TextBlock
+                        Classes="H4"
+                        Text="Ursa"
+                        Theme="{DynamicResource TitleTextBlock}" />
+                </u:NavigationMenu.Header>
+                <u:NavigationMenu.Icon>
+                    <Image
+                        Width="48"
+                        Height="48"
+                        RenderOptions.BitmapInterpolationMode="HighQuality"
+                        Source="../Assets/Ursa.ico" />
+                </u:NavigationMenu.Icon>
+                <u:NavigationMenu.ItemTemplate>
+                    <converters:MenuDataTemplateSelector>
+                        <converters:MenuDataTemplateSelector.MenuTemplate>
+                            <DataTemplate DataType="vm:MenuItemViewModel">
+                                <u:NavigationMenuItem
+                                    Command="{Binding ActivateCommand}"
+                                    Header="{Binding MenuHeader}"
+                                    ItemsSource="{Binding Children}">
+                                    <u:NavigationMenuItem.Icon>
+                                        <Ellipse
+                                            Width="10"
+                                            Height="10"
+                                            Fill="LightGray" />
+                                    </u:NavigationMenuItem.Icon>
+                                </u:NavigationMenuItem>
+                            </DataTemplate>
+                        </converters:MenuDataTemplateSelector.MenuTemplate>
+                        <converters:MenuDataTemplateSelector.SeparatorTemplate>
+                            <DataTemplate DataType="vm:MenuItemViewModel">
+                                <u:NavigationMenuSeparator Header="{Binding MenuHeader}" />
+                            </DataTemplate>
+                        </converters:MenuDataTemplateSelector.SeparatorTemplate>
+                    </converters:MenuDataTemplateSelector>
+                </u:NavigationMenu.ItemTemplate>
+            </u:NavigationMenu>
+        </Border>
+
         <ToggleButton
             Grid.Row="0"
+            Grid.Column="1"
             HorizontalAlignment="Right"
             Content="Update Theme"
             IsCheckedChanged="ToggleButton_OnIsCheckedChanged" />
-        <TabControl Grid.Row="1" TabStripPlacement="Left">
-            <TabItem Header="Badge">
-                <pages:BadgeDemo />
-            </TabItem>
-            <TabItem Header="Banner">
-                <pages:BannerDemo />
-            </TabItem>
-            <TabItem Header="ButtonGroup">
-                <pages:ButtonGroupDemo />
-            </TabItem>
-            <TabItem Header="Divider">
-                <pages:DividerDemo />
-            </TabItem>
-            <TabItem Header="IPv4Box">
-                <pages:IPv4BoxDemo />
-            </TabItem>
-            <TabItem Header="Loading">
-                <pages:LoadingDemo />
-            </TabItem>
-            <TabItem Header="Navigation">
-                <pages:NavigationMenuDemo />
-            </TabItem>
-            <TabItem Header="Pagination">
-                <pages:PaginationDemo />
-            </TabItem>
-            <TabItem Header="TagInput">
-                <pages:TagInputDemo />
-            </TabItem>
-            <TabItem Header="Timeline">
-                <pages:TimelineDemo />
-            </TabItem>
-        </TabControl>
+        <ContentControl
+            Grid.Row="1"
+            Grid.Column="1"
+            Content="{Binding Content}">
+            <ContentControl.ContentTemplate>
+                <converters:ViewLocator />
+            </ContentControl.ContentTemplate>
+        </ContentControl>
     </Grid>
 
 </Window>

src/Ursa.Themes.Semi/Controls/Navigation.axaml

@@ -24,57 +24,59 @@
                             <DoubleTransition Property="Width" Duration="0:0:0.1" />
                         </Transitions>
                     </Border.Transitions>
-                    <Grid
-                        Name="PART_RootGrid"
-                        HorizontalAlignment="Stretch"
-                        Background="{TemplateBinding Background}"
-                        RowDefinitions="Auto, *, Auto, Auto">
-                        <StackPanel
-                            Margin="{DynamicResource NavigationMenuHeaderMargin}"
-                            HorizontalAlignment="Center"
-                            Orientation="Horizontal">
-                            <ContentPresenter
-                                Name="PART_IconPresenter"
-                                Margin="{DynamicResource NavigationMenuIconMargin}"
-                                VerticalAlignment="Center"
-                                Content="{TemplateBinding Icon}" />
-                            <ContentPresenter
-                                Name="PART_HeaderPresenter"
-                                VerticalAlignment="Center"
-                                Content="{TemplateBinding Header}"
-                                ContentTemplate="{TemplateBinding HeaderTemplate}" />
+                    <ScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">
+                        <Grid
+                            Name="PART_RootGrid"
+                            HorizontalAlignment="Stretch"
+                            Background="{TemplateBinding Background}"
+                            RowDefinitions="Auto, *, Auto, Auto">
+                            <StackPanel
+                                Margin="{DynamicResource NavigationMenuHeaderMargin}"
+                                HorizontalAlignment="Center"
+                                Orientation="Horizontal">
+                                <ContentPresenter
+                                    Name="PART_IconPresenter"
+                                    Margin="{DynamicResource NavigationMenuIconMargin}"
+                                    VerticalAlignment="Center"
+                                    Content="{TemplateBinding Icon}" />
+                                <ContentPresenter
+                                    Name="PART_HeaderPresenter"
+                                    VerticalAlignment="Center"
+                                    Content="{TemplateBinding Header}"
+                                    ContentTemplate="{TemplateBinding HeaderTemplate}" />
 
-                        </StackPanel>
-                        <ItemsPresenter Grid.Row="1" ItemsPanel="{TemplateBinding ItemsPanel}" />
-                        <ContentPresenter
-                            Name="PART_FooterPresenter"
-                            Grid.Row="2"
-                            Content="{TemplateBinding Footer}"
-                            ContentTemplate="{TemplateBinding FooterTemplate}" />
-                        <ToggleSwitch
-                            Name="{x:Static u:NavigationMenu.PART_CloseButton}"
-                            Grid.Row="3"
-                            Content="Open"
-                            IsChecked="{TemplateBinding IsClosed,
-                                                        Mode=TwoWay}"
-                            IsVisible="{TemplateBinding ShowCollapseButton}"
-                            Theme="{DynamicResource ButtonToggleSwitch}">
-                            <ToggleSwitch.OnContent>
-                                <PathIcon
-                                    Width="{DynamicResource NavigationMenuExpandIconWidth}"
-                                    Height="{DynamicResource NavigationMenuExpandIconHeight}"
-                                    Data="{DynamicResource NavigationMenuExpandIconGlyph}"
-                                    Foreground="{DynamicResource ButtonDefaultTertiaryForeground}" />
-                            </ToggleSwitch.OnContent>
-                            <ToggleSwitch.OffContent>
-                                <PathIcon
-                                    Width="{DynamicResource NavigationMenuExpandIconWidth}"
-                                    Height="{DynamicResource NavigationMenuExpandIconHeight}"
-                                    Data="{DynamicResource NavigationMenuExpandIconGlyph}"
-                                    Foreground="{DynamicResource ButtonDefaultTertiaryForeground}" />
-                            </ToggleSwitch.OffContent>
-                        </ToggleSwitch>
-                    </Grid>
+                            </StackPanel>
+                            <ItemsPresenter Grid.Row="1" ItemsPanel="{TemplateBinding ItemsPanel}" />
+                            <ContentPresenter
+                                Name="PART_FooterPresenter"
+                                Grid.Row="2"
+                                Content="{TemplateBinding Footer}"
+                                ContentTemplate="{TemplateBinding FooterTemplate}" />
+                            <ToggleSwitch
+                                Name="{x:Static u:NavigationMenu.PART_CloseButton}"
+                                Grid.Row="3"
+                                Content="Open"
+                                IsChecked="{TemplateBinding IsClosed,
+                                                            Mode=TwoWay}"
+                                IsVisible="{TemplateBinding ShowCollapseButton}"
+                                Theme="{DynamicResource ButtonToggleSwitch}">
+                                <ToggleSwitch.OnContent>
+                                    <PathIcon
+                                        Width="{DynamicResource NavigationMenuExpandIconWidth}"
+                                        Height="{DynamicResource NavigationMenuExpandIconHeight}"
+                                        Data="{DynamicResource NavigationMenuExpandIconGlyph}"
+                                        Foreground="{DynamicResource ButtonDefaultTertiaryForeground}" />
+                                </ToggleSwitch.OnContent>
+                                <ToggleSwitch.OffContent>
+                                    <PathIcon
+                                        Width="{DynamicResource NavigationMenuExpandIconWidth}"
+                                        Height="{DynamicResource NavigationMenuExpandIconHeight}"
+                                        Data="{DynamicResource NavigationMenuExpandIconGlyph}"
+                                        Foreground="{DynamicResource ButtonDefaultTertiaryForeground}" />
+                                </ToggleSwitch.OffContent>
+                            </ToggleSwitch>
+                        </Grid>
+                    </ScrollViewer>
                 </Border>
             </ControlTemplate>
         </Setter>

src/Ursa/Controls/Navigation/NavigationMenuItem.cs

@@ -131,7 +131,7 @@ public class NavigationMenuItem: HeaderedSelectingItemsControl
 
         if (_rootMenu is not null)
         {
-            IsClosed = _rootMenu.IsClosed;
+            // IsClosed = _rootMenu.IsClosed;
         }
         
         _rootMenu?.GetObservable(NavigationMenu.IsClosedProperty)
@@ -139,7 +139,7 @@ public class NavigationMenuItem: HeaderedSelectingItemsControl
         _rootMenu?.UpdateSelectionFromSelectedItem(_rootMenu.SelectedItem);
         _popup = e.NameScope.Find<Popup>(PART_Popup);
         Level = CalculateDistanceFromLogicalParent<NavigationMenu>(this) - 1;
-        bool isTopLevel = Level == 1;
+        bool isTopLevel = Level == 0;
         IsTopLevelMenuItem = isTopLevel;
         PseudoClasses.Set(PC_TopLevel, isTopLevel);
     }
@@ -165,7 +165,7 @@ public class NavigationMenuItem: HeaderedSelectingItemsControl
         {
             if (_rootMenu is not null )
             {
-                object? o = this.DataContext ?? this;
+                object? o = this.DataContext == _rootMenu.DataContext ? this : this.DataContext ?? this;
                 _rootMenu.SelectedItem = o;
             }
             SetSelection(this, true, true);
@@ -219,7 +219,7 @@ public class NavigationMenuItem: HeaderedSelectingItemsControl
             }
             else
             {
-                if (selected)
+                if (selected && source!=null)
                 {
                     _rootMenu?.UpdateSelection(this);
                 }
@@ -262,7 +262,10 @@ public class NavigationMenuItem: HeaderedSelectingItemsControl
 
         while (logical != null && !(logical is T))
         {
-            ++result;
+            if (logical is NavigationMenuItem)
+            {
+                result++;
+            }
             logical = logical.LogicalParent;
         }
 

src/Ursa/Controls/TagInput/TagInput.cs

@@ -128,7 +128,7 @@ public class TagInput : TemplatedControl
     private void OnInputThemePropertyChanged(AvaloniaPropertyChangedEventArgs args)
     {
         var newTheme = args.GetNewValue<ControlTheme>();
-        if (newTheme.TargetType == typeof(TextBox))
+        if (newTheme?.TargetType == typeof(TextBox))
         {
             _textBox.Theme = newTheme;
         }