@Override
  public void update() {
    myHasGroupWithMultipleRefs = false;
    for (Map.Entry<VcsRefType, Collection<VcsRef>> typeAndRefs : myGroupedVisibleReferences.entrySet()) {
      if (typeAndRefs.getValue().size() > 1) {
        myHasGroupWithMultipleRefs = true;
        break;
      }
    }
    super.update();
  }
@Override
  public void update()