private void fill_users(AutoSuggestBox sender, AutoSuggestBoxTextChangedEventArgs args) { if (args.Reason == AutoSuggestionBoxTextChangeReason.UserInput) { if (sender.Text.Length > 0) sender.ItemsSource = GetSuggestions(sender.Text); else { sender.ItemsSource = new[] {"No suggestions..."}; sender.Background = (sender.Text == "") ? new SolidColorBrush(Colors.PaleVioletRed) : new SolidColorBrush(Colors.White); sender.UpdateLayout(); } } }