public TutorialsViewModel(IMvxNavigationService navigation, ITutorialsProvider tutorialsProvider) : base(navigation)
        {
            _tutorialsProvider = tutorialsProvider;
            _navigationService = navigation;

            TutorialSelected = new MvxAsyncCommand <TutorialDTO>(OpenTutorial);
        }
        public SectionsViewModel(IMvxNavigationService navigationService, ITutorialsProvider tutorialsProvider)
        {
            _navigationService = navigationService;
            _tutorialsProvider = tutorialsProvider;

            SectionSelected = new MvxAsyncCommand <SectionDTO>(OpenTutorials);
        }