private void ShowSurveyWithTagXamarin(object sender, EventArgs e)
        {
            NSSet tags = NSSet.MakeNSObjectSet <NSString> (new NSString [] { new NSString("xamarin") });

            ATSurveys.PresentSurveyController(tags, this);
        }
 private void ShowSurveyWithNoTags(object sender, EventArgs e)
 {
     ATSurveys.PresentSurveyControllerWithNoTags(this);
 }