Inheritance: Windows.UI.Xaml.DependencyObject
        public CurrenciesPage()
        {
            this.InitializeComponent();

            this.navigationHelper = new NavigationHelper(this);
            this.navigationHelper.LoadState += this.NavigationHelper_LoadState;
            this.navigationHelper.SaveState += this.NavigationHelper_SaveState;
        }
        public CategoryPage()
        {
            this.InitializeComponent();

            this.DataContext = App.iocContainer.Resolve<CategoryViewModel>();

            this.navigationHelper = new NavigationHelper(this);
            this.navigationHelper.LoadState += this.NavigationHelper_LoadState;
            this.navigationHelper.SaveState += this.NavigationHelper_SaveState;
        }