message: buttongroup question produces duplicated ids in knockout
diff: @@ -11,7 +11,7 @@ ko.components.register("sv-button-group-item", {
  const model = new ButtonGroupItemModel(
  params.question,
  params.item,
  - params.index
  + params.index()
  );
  const viewModel = new ButtonGroupItemViewModel(model);
  return viewModel;
  