message: Fix the typo on check
diff: @@ -465,7 +465,7 @@ export class Base {
  if (!target) target = this;
  var notifier: any = this.getSurvey();
  if (!notifier) notifier = this;
  - if (!!notifier.doPropertyValueChangedCallback) {
  + if (!!notifier.onPropertyValueChangedCallback) {
  notifier.onPropertyValueChangedCallback(
  name,
  oldValue,
  