protected override async void OnStartup(object sender, StartupEventArgs e)
{
var startupTasks =
GetAllInstances(typeof(StartupTask))
.Cast <ExportedDelegate>()
.Select(exportedDelegate => (StartupTask)exportedDelegate.CreateDelegate(typeof(StartupTask)));
startupTasks.Apply(s => s());
base.OnStartup(sender, e);
await NatHelper.DiscoverAsync();
ThemeManager.AddAppTheme("CobaltLight", new Uri("pack://application:,,,/Themes/CobaltLight.xaml"));
ThemeManager.AddAppTheme("CobaltDark", new Uri("pack://application:,,,/Themes/CobaltDark.xaml"));
ThemeManager.ChangeAppStyle(Application.Current, ThemeManager.Accents.First(a => a.Name == "Blue"),
ThemeManager.GetAppTheme("CobaltLight"));
}