public AlbumsForArtistViewModel(IEventAggregator eventAggregator)
        {
            _eventAggregator = eventAggregator;

            _albums = new ObservableCollection<Music.IAlbum>();

            _behaviors = new CompositeDisposable(
                EnsureAlbumsAreRetrievedWhenServerAvailableAndArtistSelected()
            );
        }
        public AlbumsForArtistViewModel(IEventAggregator eventAggregator)
        {
            _eventAggregator = eventAggregator;

            _albums = new ObservableCollection <Music.IAlbum>();

            _behaviors = new CompositeDisposable(
                EnsureAlbumsAreRetrievedWhenServerAvailableAndArtistSelected()
                );
        }