Silverlight Dynamic Themes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using SLDynamicThemes2.Controls;
using System.IO;

namespace SLDynamicThemes2
{
    public partial class TestChildWindow : CustomChildWindow
    {
        public TestChildWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void ThemeNameTextBlock_Loaded(object sender, RoutedEventArgs e)
        {
            App app = (App)App.Current;
            MainPage mainPage = app.RootVisual as MainPage;
            TextBlock textBlock = sender as TextBlock;
            textBlock.Text = System.IO.Path.GetFileName(mainPage.CurrentThemeUri.ToString());
        }
    }
}