protected override async void OnNavigatedTo(NavigationEventArgs e)
{
this.navigationHelper.OnNavigatedTo(e);
progressRing.IsActive = true;
spButtons.IsTapEnabled = false;
oasaFeedCollection = await OasaReader.getFeedsAsync(oasaUrl);
apergiaFeedCollection = await ApergiaReader.getFeedsAsync(apergiaMMMUrl);
progressRing.IsActive = false;
spButtons.IsTapEnabled = true;
}