Navigating the different modules through a TreeView and ToolBar with Prism

using System;
using System.Windows;

namespace NavShell
{
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

#if (DEBUG)
            RunInDebugMode();
#else
            RunInReleaseMode();
#endif
            this.ShutdownMode = ShutdownMode.OnMainWindowClose;
        }

        private static void RunInDebugMode()
        {
            Bootstrapper bootstrapper = new Bootstrapper();
            bootstrapper.Run();
        }

        private static void RunInReleaseMode()
        {
            AppDomain.CurrentDomain.UnhandledException += AppDomainUnhandledException;
            try
            {
                Bootstrapper bootstrapper = new Bootstrapper();
                bootstrapper.Run();
            }
            catch (Exception ex)
            {
                HandleException(ex);
            }
        }

        private static void AppDomainUnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            HandleException(e.ExceptionObject as Exception);
        }

        private static void HandleException(Exception ex)
        {
            if (ex == null) return;

            MessageBox.Show(NavShell.Properties.Resources.UnhandledException);
            Environment.Exit(1);
        }
    }
}