public MainViewModel()
 {
     m_serializationService = ServiceLocator.Current.GetInstance<ISerializationService>();
     Messenger.Default.Register<string>(this, "FileSaved", (pathIGotFromTheUser) =>
     {
         m_serializationService.SaveProject(pathIGotFromTheUser);
         //Give a feedback that everything has been correctly saved(for test purpose, a MessageBox.Show() )
         Messenger.Default.Send<NotificationMessage>(new NotificationMessage("WentWell"));
     });           
 }