public MainPageViewModel(IApplicationModel applicationModel) { _applicationModel = applicationModel; //ReactiveBinder.Bind(() => _applicationModel.Title, () => Title); //ReactiveBinder.Bind(_applicationModel.ObserveProperty(x => x.Title), () => Title); _applicationModel .ObserveProperty(x => x.Title) .Select(x => x + " append.") .Bind(() => Title); }