*/
public PageArrayList sortChildsByGivenHeadlines(SortedSet<String> orderedHeadlines) throws RQLException {
// create comparator and sort
SortedHeadlinesPageComparator comparator = new SortedHeadlinesPageComparator(orderedHeadlines);
PageArrayList sortedChilds = getChildPages().sort(comparator);
// update cms
changeOrder(sortedChilds);
return sortedChilds;