code: public void getChildren(
          final CmsUUID entryId,
          final boolean setOpen,
          final AsyncCallback<CmsClientSitemapEntry> callback) {
  
          getChildren(entryId, setOpen, false, callback);
  
      }
docs: Retrieves the child entries of the given node from the server.<p>
  
  @param entryId the entry id
  @param setOpen if the entry should be opened
  
  @param callback the callback to execute after the children have been loaded