this.engine=engine;
}
protected List<TreeNode> getChildren() {
List<Object> children = new ArrayList<Object>();
GFacURLs gFacURLs = new GFacURLs(getRegistry());
children.add(gFacURLs);
HostDescriptions hostDescriptions = new HostDescriptions(getRegistry());
children.add(hostDescriptions);
ServiceDescriptions serviceDescriptions = new ServiceDescriptions(getRegistry());
children.add(serviceDescriptions);