如何引用WPF嵌套ListView中的控件？

<ListView x:Name="outerListView" ItemsSource="{Binding OuterItems}">
    <!-- 嵌套的ListView -->
    <ListView x:Name="innerListView" ItemsSource="{Binding InnerItems}">
        <!-- 内部控件 -->
        <ListView.ItemTemplate>
            <DataTemplate>
                <StackPanel>
                    <TextBlock Text="{Binding InnerProperty1}" />
                    <Button Content="{Binding InnerProperty2}" />
                </StackPanel>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</ListView>

private void outerListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    // 获取innerListView中选中项的控件
    ListView innerListView = FindVisualChild<ListView>(outerListView);
    if (innerListView != null)
    {
        // 访问innerListView中的控件
        foreach (var item in innerListView.SelectedItems)
        {
            // 处理选中项的控件
            // ...
        }
    }
}

private T FindVisualChild<T>(DependencyObject parent) where T : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
    {
        var child = VisualTreeHelper.GetChild(parent, i);
        if (child is T)
            return (T)child;
        else
        {
            var result = FindVisualChild<T>(child);
            if (result != null)
                return result;
        }
    }
    return null;
}