* do whatever is needed after the content is loaded (e.g. refresh browser tree..)
*/
public abstract void notifyChangeListeners();
public void setElements(List<T> elements) {
Filter filter = getFilter();
filterHashCode = filter == null ? 0 : filter.hashCode();
if (isDisposed || elements == null || elements.size() == 0) {
elements = EMPTY_LIST;
index = null;
} else {