public TutorialViewModel(IDbManager dbManager, IViewMainViewModel mainViewModel)
        {
            this.dbManager = dbManager;
            MainViewModel  = mainViewModel;

            BackToMenuCommand = new RelayCommand(BackToMenu);
        }
        public MenuViewModel(IDbManager dbManager, IViewMainViewModel mainViewModel)
        {
            this.dbManager     = dbManager;
            this.mainViewModel = (MainViewModel)mainViewModel;

            CategoriesCommand           = new RelayCommand(this.mainViewModel.OpenCategories);
            IngredientsCommand          = new RelayCommand(this.mainViewModel.OpenIngredients);
            RecipesCommand              = new RelayCommandAsync(this.mainViewModel.OpenRecipes);
            IngredientQuantitiesCommand = new RelayCommand(this.mainViewModel.OpenIngredientQuantities);
        }
        public MainView(IViewMainViewModel mainViewModel)
        {
            InitializeComponent();

            DataContext = mainViewModel;
        }