protected override IModuleCatalog CreateModuleCatalog()
{
#if SILVERLIGHT
return Microsoft.Practices.Prism.Modularity.ModuleCatalog.CreateFromXaml(new Uri("/Modularity.Sl;component/ModulesCatalog.xaml", UriKind.Relative));
#else
return new AggregateModuleCatalog();
#endif
}