WPF主详细信息在列表更改后未保存值

Question

已经编写了这段代码，实际上是我对Microsoft教程进行的简单修改：https://docs.microsoft.com/de-de/dotnet/framework/wpf/data/how-to-use-the-master-detail-pattern-with-hierarchical-xml-data

我不明白为什么单选按钮选择在更改后不保持其状态，可以说除法，例如这种模式：

联盟A->部门A->小组III（选择了单选按钮）

收件人：

联盟A-> B部门-> A部门

您会看到 Team III 的单选按钮不再处于选中状态。

该如何解决？

这是此代码段：

MainWindow.xml

<Window x:Class="MasterDetailXml.MainWindow"
        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:MasterDetailXml"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <XmlDataProvider x:Key="MyList" Source="Data\Leagues.xml"
                       XPath="Leagues/League"/>
        <DataTemplate x:Key="DataTemplateX">
            <TextBlock Text="{Binding XPath=@name}" />
        </DataTemplate>
        <Style TargetType="StackPanel">
            <Setter Property="DockPanel.Dock" Value="Left"/>
            <Setter Property="Margin" Value="10,0,10,0"/>
        </Style>
        <Style TargetType="ListBox">
            <Setter Property="Height" Value="100"/>
        </Style>
        <Style TargetType="Label">
            <Setter Property="FontSize" Value="12"/>
        </Style>
    </Window.Resources>
    <DockPanel DataContext="{Binding Source={StaticResource MyList}}">
        <StackPanel>
            <Label>My Soccer Leagues</Label>
            <ListBox ItemsSource="{Binding}"
                 ItemTemplate="{StaticResource DataTemplateX}"
                 IsSynchronizedWithCurrentItem="True"/>
        </StackPanel>

        <StackPanel>
            <Label Content="{Binding XPath=@name}"/>
            <ListBox Name="divisionsListBox"
                 ItemsSource="{Binding XPath=Division}"
                 ItemTemplate="{StaticResource DataTemplateX}"
                 IsSynchronizedWithCurrentItem="True"/>
        </StackPanel>
        <StackPanel>
            <Label Content="{Binding XPath=@name}"/>
            <ListView DataContext="{Binding ElementName=divisionsListBox,
                                       Path=SelectedItem}"
                      ItemsSource="{Binding XPath=Team}"
                      IsSynchronizedWithCurrentItem="True">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <RadioButton Content="{Binding XPath=@name}" GroupName="Teams">
                        </RadioButton>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackPanel>
    </DockPanel>
</Window>

数据：

<?xml version="1.0" encoding="utf-8" ?>
<Leagues xmlns="">
  <League name="League A">
    <Division name="Division A">
      <Team name="Team I"/>
      <Team name="Team II"/>
      <Team name="Team III"/>
      <Team name="Team IV"/>
      <Team name="Team V"/>
    </Division>
    <Division name="Division B">
      <Team name="Team Blue"/>
      <Team name="Team Red"/>
      <Team name="Team Yellow"/>
      <Team name="Team Green"/>
      <Team name="Team Orange"/>
    </Division>
    <Division name="Division C">
      <Team name="Team East"/>
      <Team name="Team West"/>
      <Team name="Team North"/>
      <Team name="Team South"/>
    </Division>
  </League>
  <League name="League B">
    <Division name="Division A">
      <Team name="Team 1"/>
      <Team name="Team 2"/>
      <Team name="Team 3"/>
      <Team name="Team 4"/>
      <Team name="Team 5"/>
    </Division>
    <Division name="Division B">
      <Team name="Team Diamond"/>
      <Team name="Team Heart"/>
      <Team name="Team Club"/>
      <Team name="Team Spade"/>
    </Division>
    <Division name="Division C">
      <Team name="Team Alpha"/>
      <Team name="Team Beta"/>
      <Team name="Team Gamma"/>
      <Team name="Team Delta"/>
      <Team name="Team Epsilon"/>
    </Division>
  </League>
</Leagues>