Download "XAP" Packages on Demand in Silverlight

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;

namespace XapLoader
{
    public partial class App : Application
    {
        public Grid ApplicationVisualRoot;

        public App()
        {
            this.Startup += this.Application_Startup;
            this.Exit += this.Application_Exit;
            this.UnhandledException += this.Application_UnhandledException;

            InitializeComponent();
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            ApplicationVisualRoot = new Grid();
            ApplicationVisualRoot.Children.Add(new Splash());
            this.RootVisual = ApplicationVisualRoot;
        }

        private void Application_Exit(object sender, EventArgs e) { }

        private void Application_UnhandledException(object sender,
            ApplicationUnhandledExceptionEventArgs e)
        {
            if (!System.Diagnostics.Debugger.IsAttached)
            {
                e.Handled = true;
                Deployment.Current.Dispatcher
                    .BeginInvoke(delegate { ReportErrorToDOM(e); });
            }
        }

        private void ReportErrorToDOM(ApplicationUnhandledExceptionEventArgs e)
        {
            try
            {
                string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace;
                errorMsg = errorMsg.Replace('"', '\'').Replace("\r\n", @"\n");

                System.Windows.Browser.HtmlPage
                    .Window.Eval("throw new Error(\"Unhandled Error in Silverlight Application "
                    + errorMsg + "\");");
            }
            catch (Exception) { }
        }
    }
}