NASAControl controlFactory = new NASAControl();
try {
List<?> tiledGroups = tiledPatterns.getChildren("TiledGroup"); //$NON-NLS-1$
WMTService service = serviceExtension.createService(NASASource.class);
List<IGeoResource> geoResources = service.emptyResourcesList(null);
geoResources.clear();
WMTWizardTreeItemData data = new WMTWizardTreeItemData(service, controlFactory);
treeItem.setData(data);