C# WPF binding -组合框选择项到列表框？

<ComboBox ItemsSource="{Binding ComboBoxItems}" SelectedItem="{Binding SelectedItem}" />
<ListBox ItemsSource="{Binding ListBoxItems}" />

public class ViewModel : INotifyPropertyChanged
{
    private ObservableCollection<string> comboBoxItems;
    private string selectedItem;
    private ObservableCollection<string> listBoxItems;

    public ObservableCollection<string> ComboBoxItems
    {
        get { return comboBoxItems; }
        set
        {
            comboBoxItems = value;
            OnPropertyChanged(nameof(ComboBoxItems));
        }
    }

    public string SelectedItem
    {
        get { return selectedItem; }
        set
        {
            selectedItem = value;
            OnPropertyChanged(nameof(SelectedItem));
            UpdateListBoxItems();
        }
    }

    public ObservableCollection<string> ListBoxItems
    {
        get { return listBoxItems; }
        set
        {
            listBoxItems = value;
            OnPropertyChanged(nameof(ListBoxItems));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    private void UpdateListBoxItems()
    {
        // 根据选择的项更新ListBoxItems集合
    }
}

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new ViewModel();
    }
}