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 System.Windows.Controls.Theming;
using System.Diagnostics;

namespace SLDynamicThemes2
{
    public partial class MainPage : UserControl
    {
        private Uri currentThemeUri = null;

        public MainPage()
        {
            InitializeComponent();
            currentThemeUri = new Uri("/SLDynamicThemes2;component/Assets/Themes/JetPack.xaml", UriKind.Relative);
        }

        public Uri CurrentThemeUri
        {
            get { return currentThemeUri; }
            set { currentThemeUri = value; }
        }

        void ThemeButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                Button button = sender as Button;
                if (button.Tag != null)
                {
                    string themeName = button.Tag.ToString();
                    if (!String.IsNullOrEmpty(themeName))
                    {
                        Uri themeUri = new Uri(string.Format(@"/SLDynamicThemes2;component/Assets/Themes/{0}", themeName), UriKind.Relative);
                        ThemeContainer.ThemeUri = currentThemeUri = themeUri;
                    }
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine(String.Format("An error occurred during changing theme"));
                Debug.WriteLine(ex);
            }
        }
    }
}