ダイナミックメニューにDataTemplateを使用しているときにホットキーが機能しないのはなぜですか？

Question

自分のタイプのコレクションをメニューにバインドできます。しかし、私はホットキーで苦労しています。いずれかのホットキーが表示されますが、機能しないか、ホットキーが表示されずに動作します。

ここで何がうまくいかないと思いますか？

public class Category : DependencyObject 
{ 
    public string Caption 
    { 
     get { return (string)GetValue(CaptionProperty); } 
     set { SetValue(CaptionProperty, value); } 
    } 
    public static readonly DependencyProperty CaptionProperty = 
     DependencyProperty.Register("Caption", typeof(string), typeof(Category), new PropertyMetadata(null)); 

    public ObservableCollection<Item> SubItems 
    { 
     get { return (ObservableCollection<Item>)GetValue(SubItemsProperty); } 
     set { SetValue(SubItemsProperty, value); } 
    } 
    public static readonly DependencyProperty SubItemsProperty = 
     DependencyProperty.Register("SubItems", typeof(ObservableCollection<Item>), typeof(Category), new PropertyMetadata(null)); 
} 
public class Item : DependencyObject 
{ 
    public string Header 
    { 
     get { return (string)GetValue(HeaderProperty); } 
     set { SetValue(HeaderProperty, value); } 
    } 
    public static readonly DependencyProperty HeaderProperty = 
     DependencyProperty.Register("Header", typeof(string), typeof(Item), new PropertyMetadata(null)); 
} 
public class MenuViewModel : DependencyObject 
{ 
    public ObservableCollection<Category> MenuCategories 
    { 
     get { return (ObservableCollection<Category>)GetValue(MenuCategoriesProperty); } 
     set { SetValue(MenuCategoriesProperty, value); } 
    } 
    public static readonly DependencyProperty MenuCategoriesProperty = 
     DependencyProperty.Register("MenuCategories", typeof(ObservableCollection<Category>), typeof(MenuViewModel), new PropertyMetadata(null)); 

    public MenuViewModel() 
    { 
     MenuCategories = new ObservableCollection<Category>() 
     { 
      new Category() {Caption = "_One", SubItems = new ObservableCollection<Item>() { new Item() { Header = "_one"}, new Item() { Header = "t_wo" }, new Item() { Header = "_three" } } }, 
      new Category() {Caption = "_Two", SubItems = new ObservableCollection<Item>() { new Item() { Header = "_one"}, new Item() { Header = "t_wo" }, new Item() { Header = "_three" } } }, 
     }; 
    } 
} 
public partial class Test1Window : Window 
{ 
    public Test1Window() 
    { 
     InitializeComponent(); 
     DataContext = new MenuViewModel(); 
    } 
} 
public class MenuItemContainerTemplateSelector : ItemContainerTemplateSelector 
{ 
    public override DataTemplate SelectTemplate(object item, ItemsControl parentItemsControl) 
    { 
     var key = new DataTemplateKey(item.GetType()); 
     return (DataTemplate)parentItemsControl.FindResource(key); 
    } 
} 

とXAML 1.試し：

<Window x:Class="DynamicMenuTest.Test1Window" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:local="clr-namespace:DynamicMenuTest" 
    mc:Ignorable="d" 
    Title="Test1Window" Height="300" Width="300"> 
<Window.Resources> 

    <local:MenuItemContainerTemplateSelector x:Key="MenuItemContainerTemplateSelector"/> 

    <DataTemplate DataType="{x:Type local:Item}"> 
     <MenuItem Header="{Binding Header}"> 
      <MenuItem.HeaderTemplate> 
       <DataTemplate> 
        <AccessText VerticalAlignment="Center" Text="{Binding}" /> 
       </DataTemplate> 
      </MenuItem.HeaderTemplate> 
     </MenuItem> 
    </DataTemplate> 

    <HierarchicalDataTemplate DataType="{x:Type local:Category}" ItemsSource="{Binding SubItems}"> 
     <MenuItem VerticalContentAlignment="Center"> 
      <!-- Hotkey works but doesn't show up --> 
      <MenuItem.Header> 
       <AccessText Text="{Binding Caption}"/> 
      </MenuItem.Header> 
     </MenuItem> 
    </HierarchicalDataTemplate> 

</Window.Resources> 
<Grid> 
    <Menu ItemsSource="{Binding MenuCategories}" 
     UsesItemContainerTemplate ="true" 
     ItemContainerTemplateSelector="{StaticResource MenuItemContainerTemplateSelector}" 
    /> 
</Grid> 

XAML 2.試してみてください。

<Window x:Class="DynamicMenuTest.Test2Window" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:local="clr-namespace:DynamicMenuTest" 
    mc:Ignorable="d" 
    Title="Test2Window" Height="300" Width="300"> 
<Window.Resources> 

    <local:MenuItemContainerTemplateSelector x:Key="MenuItemContainerTemplateSelector"/> 

    <DataTemplate DataType="{x:Type local:Item}"> 
     <MenuItem Header="{Binding Header}"> 
      <MenuItem.HeaderTemplate> 
       <DataTemplate> 
        <AccessText VerticalAlignment="Center" Text="{Binding}" /> 
       </DataTemplate> 
      </MenuItem.HeaderTemplate> 
     </MenuItem> 
    </DataTemplate> 

    <HierarchicalDataTemplate DataType="{x:Type local:Category}" ItemsSource="{Binding SubItems}"> 
     <MenuItem 
      Header="{Binding Caption}" 
      VerticalContentAlignment="Center"> 

      <!-- Hotkey shows up but menu not working --> 
      <MenuItem.HeaderTemplate> 
       <DataTemplate> 
        <ContentPresenter RecognizesAccessKey="True" Content="{Binding }" VerticalAlignment="Center" Margin="4,0"/> 
       </DataTemplate> 
      </MenuItem.HeaderTemplate> 
     </MenuItem> 
    </HierarchicalDataTemplate> 

</Window.Resources> 
<Grid> 
    <Menu ItemsSource="{Binding MenuCategories}" 
     UsesItemContainerTemplate ="true" 
     ItemContainerTemplateSelector="{StaticResource MenuItemContainerTemplateSelector}" 
    /> 
</Grid> 

ここ

は削ぎ落としたコードです

XAML 3.試してみてください。

<Window x:Class="DynamicMenuTest.Test3Window" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:local="clr-namespace:DynamicMenuTest" 
    mc:Ignorable="d" 
    Title="Test3Window" Height="300" Width="300"> 
<Window.Resources> 

    <local:MenuItemContainerTemplateSelector x:Key="MenuItemContainerTemplateSelector"/> 

    <DataTemplate DataType="{x:Type local:Item}"> 
     <MenuItem Header="{Binding Header}"> 
      <MenuItem.HeaderTemplate> 
       <DataTemplate> 
        <AccessText VerticalAlignment="Center" Text="{Binding}" /> 
       </DataTemplate> 
      </MenuItem.HeaderTemplate> 
     </MenuItem> 
    </DataTemplate> 

    <HierarchicalDataTemplate DataType="{x:Type local:Category}" ItemsSource="{Binding SubItems}"> 
     <MenuItem 
      Header="{Binding Caption}" 
      VerticalContentAlignment="Center"> 
      <!-- Hotkey shows up but menu doesn't work --> 
      <MenuItem.HeaderTemplate> 
       <DataTemplate> 
        <AccessText Text="{Binding}" VerticalAlignment="Center" Margin="4,0"/> 
       </DataTemplate> 
      </MenuItem.HeaderTemplate> 
     </MenuItem> 
    </HierarchicalDataTemplate> 

</Window.Resources> 
<Grid> 
    <Menu ItemsSource="{Binding MenuCategories}" 
     UsesItemContainerTemplate ="true" 
     ItemContainerTemplateSelector="{StaticResource MenuItemContainerTemplateSelector}" 
    /> 
</Grid>