Ref ref = _refs != null && !_refs.isEmpty() ? _refs.iterator().next() : null;
if (ref != null) {
final Book book = _sheet.getBook();
if (book != null) {
if (Strings.isBlank(name)) {
book.createSheet();
} else {
book.createSheet(name);
}
BookHelper.notifyCreateSheet(ref, name);
}