public DetailFloorPageViewModel(INavigationService navigationService, IRepository <MyGroupHeader> repository) { _navigationService = navigationService; _repository = repository; CloseButtonClickCommand = new AsyncReactiveCommand(); CloseButtonClickCommand.Subscribe(async() => { await _navigationService.GoBackAsync(null, true); }).AddTo(this.Disposable); Title.AddTo(this.Disposable); ImageSource.AddTo(this.Disposable); }