public ApplicationViewModel()
        {
            leftImageDownloader = new ImageDownloaderViewModel();
            leftImageDownloader.PropertyChanged += LeftImageDownloader_PropertyChanged;

            rightImageDownloader = new ImageDownloaderViewModel();
            rightImageDownloader.PropertyChanged += RightImageDownloader_PropertyChanged;

            centerImageDownloader = new ImageDownloaderViewModel();
            centerImageDownloader.PropertyChanged += CenterImageDownloader_PropertyChanged;
        }
        public ImageDownloaderComponent()
        {
            InitializeComponent();

            DataContext = new ImageDownloaderViewModel();
        }