tree.expandPath(new TreePath(tree.getModel().getRoot()));
if (mod != null) tree.expandPath(new TreePath(mod.getRoot()));
	public void installUI(JComponent c)	{		super.installUI(c);		installDefaults((JTree) c);		tree = (JTree) c;		setModel(tree.getModel());      tree.setRootVisible(true);    tree.expandPath(new TreePath(tree.getModel().getRoot()));		treeSelectionModel = tree.getSelectionModel();		installListeners();		installKeyboardActions();		completeUIInstall();	}