private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            FeedConfigViewModel dc = this.DataContext as FeedConfigViewModel;

            dc.Feeds.Add(new FeedItemInfo(this.tbName.Text, this.tbUrl.Text, this.cbLanguage.SelectedItem as string));
        }
        private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            FeedConfigViewModel dc = this.DataContext as FeedConfigViewModel;

            dc.Feeds.Remove(this.lbFeeds.SelectedItem as FeedItemInfo);
        }
        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            FeedConfigViewModel dc = this.DataContext as FeedConfigViewModel;

            WorkspaceService.Instance.Settings.Feed.Feeds = dc.Feeds.ToList <FeedItemInfo>();
        }