bugTree.setShowsRootHandles(false);
bugTree.setShowsRootHandles(true);
    private void postInitComponents() {        viewPanelLayout = (CardLayout) viewPanel.getLayout();        navigatorTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);        // Add a tree selection listener to the navigator tree, so we can        // ensure that the view is always consistent with the current selection.        navigatorTree.addTreeSelectionListener(new TreeSelectionListener() {            public void valueChanged(TreeSelectionEvent e) {                navigatorTreeSelectionChanged(e);            }        });        navigatorTree.setCellRenderer(new FindBugsFrame.NavigatorCellRenderer());        navigatorTree.setRootVisible(false);        navigatorTree.setShowsRootHandles(true);        bugTree.setCellRenderer(new FindBugsFrame.BugCellRenderer());        bugTree.setRootVisible(false);        bugTree.setShowsRootHandles(false);        	jarFileList.setModel(new DefaultListModel());	sourceDirList.setModel(new DefaultListModel());    }