private void InitModules()
        {
            ViewInjectionManager.Default.Inject(
                Regions.Navigation,
                ModuleType.Customers,
                () => NavigationItemViewModel.Create("Customers", new BitmapImage(new Uri(@"../Images/Customers.png", UriKind.RelativeOrAbsolute)), ModuleType.Customers),
                typeof(NavigationItemView)
                );
            ViewInjectionManager.Default.Inject(
                Regions.Navigation,
                ModuleType.Sales,
                () => NavigationItemViewModel.Create("Sales", new BitmapImage(new Uri(@"../Images/Sales.png", UriKind.RelativeOrAbsolute)), ModuleType.Sales),
                typeof(NavigationItemView)
                );
            ViewInjectionManager.Default.Inject(
                Regions.Navigation,
                ModuleType.Products,
                () => NavigationItemViewModel.Create("Products", new BitmapImage(new Uri(@"../Images/Products.png", UriKind.RelativeOrAbsolute)), ModuleType.Products),
                typeof(NavigationItemView)
                );
            ViewInjectionManager.Default.Inject(Regions.Main, ModuleType.Customers, () => CustomersViewModel.Create(), typeof(CustomersView));
            ViewInjectionManager.Default.Inject(Regions.Main, ModuleType.Sales, () => SalesViewModel.Create(), typeof(SalesView));
            ViewInjectionManager.Default.Inject(Regions.Main, ModuleType.Products, () => ProductsViewModel.Create(), typeof(ProductsView));

            ViewInjectionManager.Default.Navigate(Regions.Navigation, ModuleType.Customers);
            ViewInjectionManager.Default.Navigate(Regions.Main, ModuleType.Customers);
        }