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    <p>Eventually I did it this way.</p> <p>Following the idea of o_q, I created NavigationWindow as MainWindow and changed all the the views to page.</p> <p>Then, I created an inteface and a class which using Navigation:</p> <pre><code>public interface INavigationService { event NavigatingCancelEventHandler Navigating; void NavigateTo(Uri pageUri); void GoBack(); } public class NavigationService : INavigationService { private NavigationWindow _mainFrame; #region Implementation of INavigationService public event NavigatingCancelEventHandler Navigating; public void NavigateTo(Uri pageUri) { if (EnsureMainFrame()) { _mainFrame.Navigate(pageUri); } } public void GoBack() { if (EnsureMainFrame() &amp;&amp; _mainFrame.CanGoBack) { _mainFrame.GoBack(); } } #endregion private bool EnsureMainFrame() { if (_mainFrame != null) { return true; } _mainFrame = System.Windows.Application.Current.MainWindow as NavigationWindow; if (_mainFrame != null) { // Could be null if the app runs inside a design tool _mainFrame.Navigating += (s, e) =&gt; { if (Navigating != null) { Navigating(s, e); } }; return true; } return false; } } </code></pre> <p>Then, in viewModelLocator I created all the const string nedded to store the paths to my views:</p> <pre><code>public class ViewModelLocator { #region Views Paths public const string FrontendViewPath = "../Views/FrontendView.xaml"; public const string BackendViewPath = "../Views/BackendView.xaml"; public const string StartUpViewPath = "../Views/StartUpView.xaml"; public const string LoginViewPath = "../Views/LoginView.xaml"; public const string OutOfOrderViewPath = "../Views/OutOfOrderView.xaml"; public const string OperativeViewPath = "../Views/SubViews/OperativeView.xaml"; public const string ConfigurationViewPath = "../Views/SubViews/ConfigurationView.xaml"; #endregion </code></pre> <p>In App.cs, in the Application_Startup event handler, with the help of Unity IoC I registered a singleton of NavigationService:</p> <pre><code>public partial class App : System.Windows.Application { private static IUnityContainer _ambientContainer; public static IServiceLocator AmbientLocator { get; private set; } ... private void Application_Startup(object sender, System.Windows.StartupEventArgs e) { _ambientContainer = new UnityContainer(); _ambientContainer.RegisterType&lt;INavigationService, NavigationService&gt;(new ContainerControlledLifetimeManager()); AmbientLocator = new UnityServiceLocator(_ambientContainer); ServiceLocator.SetLocatorProvider(() =&gt; AmbientLocator); </code></pre> <p>Now, in my ViewModelLocator, I can register a "Galasoft" message to catch all the events and navigate to a page; in the constructor I have:</p> <pre><code> public ViewModelLocator() { CreateMain(); CreateFrontend(); CreateBackend(); CreateStartUp(); CreateOperative(); CreateLogin(); CreateConfiguration(); CreateOutOfOrder(); // Set Sturtup Page... ServiceLocator.Current.GetInstance&lt;INavigationService&gt;().NavigateTo(new Uri(StartUpViewPath, UriKind.Relative)); Messenger.Default.Register&lt;MoveToViewMessage&gt;(this, message =&gt; { switch (message.StateInfo.StateType) { case StateType.StartUpState: ServiceLocator.Current.GetInstance&lt;INavigationService&gt;().NavigateTo(new Uri(StartUpViewPath,UriKind.Relative)); break; case StateType.LoginState: ServiceLocator.Current.GetInstance&lt;INavigationService&gt;().NavigateTo(new Uri(LoginViewPath, UriKind.Relative)); break; case StateType.OperativeState: ServiceLocator.Current.GetInstance&lt;INavigationService&gt;().NavigateTo(new Uri(OperativeViewPath, UriKind.Relative)); break; case StateType.ConfigurationState: ServiceLocator.Current.GetInstance&lt;INavigationService&gt;().NavigateTo(new Uri(ConfigurationViewPath, UriKind.Relative)); break; case StateType.ClosedState: case StateType.OutOfOrderState: ServiceLocator.Current.GetInstance&lt;INavigationService&gt;().NavigateTo(new Uri(OutOfOrderViewPath, UriKind.Relative)); break; default: ServiceLocator.Current.GetInstance&lt;INavigationService&gt;().NavigateTo(new Uri(StartUpViewPath, UriKind.Relative)); break; } }); } </code></pre> <p>In this way I keep all the viewModels "ignorant"... they don't know anything about navigation, plus I don't have code behind.</p> <p>If I need to navigate by using a button from a view I can resolve NavigationService from the connected viewModel and navigate to the Page I need.</p> <p>And, most important thing, it works!</p>
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