private static Manageable findSub(Manageable target, String sub) {
String[] parts = sub.split("/", 3);
String seg = parts[0];
String id = parts[1];
List<? extends Manageable> segment = target.getManageableChildren().get(seg);
U.must(segment != null, "Cannot find the manageable segment: %s", seg);
target = findById(segment, id);
U.must(target != null, "Cannot find the sub-manageable with id: %s in segment: %s", id, seg);
target.reloadManageable();
return parts.length > 2 ? findSub(target, parts[2]) : target;
}