SQL CE - Insert item and update list box

Question

Hi!

I have set up a small test database to get familiar with SQL CE. My code looks like this:

    Test db;
    public Window1()
    {
        InitializeComponent();

        db = new Test("Data Source=test.sdf;");

        if (!db.DatabaseExists())
            db.CreateDatabase();

        this.List.ItemsSource = db.List;
    }

    private void Add_Click(object sender, RoutedEventArgs e)
    {
        var item = new List();
        item.Value = this.New.Text;
        db.List.InsertOnSubmit(item);
        db.SubmitChanges();
        this.New.Clear();
    }

Works fine, except the listbox is not updated! How can I tell the listbox: "Hey, I've inserted an item, look for it NOW!"?

Thanks