public RssPresenter()
{
this.InitializeComponent();
oasaFeedCollection = new ObservableCollection<oasaFeedItem>();
apergiaFeedCollection = new ObservableCollection<apergiaFeedItem>();
this.navigationHelper = new NavigationHelper(this);
this.navigationHelper.LoadState += this.NavigationHelper_LoadState;
this.navigationHelper.SaveState += this.NavigationHelper_SaveState;
}