private async void AppBarButton_Delete(object sender, RoutedEventArgs e)
{
int itemId = ((Driver)this.DefaultViewModel["Driver"]).Id;
string response = await SampleDataSource.DeleteDriver(itemId);
MessageDialog msgbox = new MessageDialog("Driver deleted! Byebye!");
await msgbox.ShowAsync();
if (!Frame.Navigate(typeof(HubPage)))
{
var resourceLoader = ResourceLoader.GetForCurrentView("Resources");
throw new Exception(resourceLoader.GetString("NavigationFailedExceptionMessage"));
}
}