TreeItem pkg = ExplorerNodeConfig.getPackageItemStructure( parentConf.name, snapInfo.uuid, itemWidgets );
pkg.setUserObject( snapInfo );
root.addItem( pkg );
ScrollPanel packagesTreeItemPanel = new ScrollPanel( root );
root.addSelectionHandler( new SelectionHandler<TreeItem>() {
public void onSelection(SelectionEvent<TreeItem> event) {
Object uo = event.getSelectedItem().getUserObject();
if ( uo instanceof Object[] ) {
Object o = ((Object[]) uo)[0];
showAssetList( (String[]) o );