| Index: samples/survey/web/elements/question/question_element.dart | 
| diff --git a/samples/survey/web/elements/question/question_element.dart b/samples/survey/web/elements/question/question_element.dart | 
| index ccc07bee870d454969501b70f92f853df70509ed..adf5a25931a8b73a10ba7a50e8eaecf2f8fdc748 100644 | 
| --- a/samples/survey/web/elements/question/question_element.dart | 
| +++ b/samples/survey/web/elements/question/question_element.dart | 
| @@ -45,7 +45,7 @@ class QuestionElement extends PolymerElement with Observable { | 
|  | 
| QuestionElement() { | 
| new PathObserver(this, 'widgetSelectedIndex').changes.listen((_) { | 
| -      notifyProperty(this, #widgetSelection); | 
| +      this.notifyPropertyChange(#widgetSelection, null, null); | 
| }); | 
| } | 
|  | 
| @@ -119,4 +119,4 @@ class QuestionElement extends PolymerElement with Observable { | 
| e.preventDefault(); | 
| question.answers = [sender.value.trim()]; | 
| } | 
| -} | 
| +} | 
|  |