在Listbox.ItemTemplate中找到控件(WPF C#)

<ListBox x:Name="myListBox">
    <ListBox.ItemTemplate>
        <DataTemplate>
           <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Name}" />
                <TextBlock Text="{Binding Age}" />
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

public MainWindow()
{
    InitializeComponent();

    List<Person> people = new List<Person>
    {
        new Person { Name = "John", Age = 30 },
        new Person { Name = "Jane", Age = 25 },
        new Person { Name = "Bob", Age = 40 }
    };

    myListBox.ItemsSource = people;
}

TextBlock nameTextBlock = (TextBlock)myListBox.ItemContainerGenerator.ContainerFromIndex(0).FindName("nameTextBlock");