@Override
  public boolean isEnabled(ViewContext context, Content[] selectedContents, String place) {
    for (Content content : context.getContentManager().getContents()) {
      if (content.isPinned()) return super.isEnabled(context, selectedContents, place);
    }
    return false;
  }
@Override
  public boolean isEnabled(ViewContext context, Content[] selectedContents, String place)