public ClosableInternalWebViewPageViewModel(INavigationService navigationService, IRepository <Announcement> announceRep)
        {
            _navigationService = navigationService;
            _repository        = announceRep;

            CloseButtonClickCommand = new AsyncReactiveCommand();
            CloseButtonClickCommand.Subscribe(async() =>
            {
                await _navigationService.GoBackAsync(null, true);
            }).AddTo(this.Disposable);

            Title.AddTo(this.Disposable);
            Content.AddTo(this.Disposable);
        }