protected void initTree() {
   ((DefaultTreeModel) myTree.getModel()).setRoot(myRoot);
   myTree.setRootVisible(false);
   myTree.setShowsRootHandles(true);
   UIUtil.setLineStyleAngled(myTree);
   TreeUtil.installActions(myTree);
   myTree.setCellRenderer(
       new ColoredTreeCellRenderer() {
         public void customizeCellRenderer(
             JTree tree,
             Object value,
             boolean selected,
             boolean expanded,
             boolean leaf,
             int row,
             boolean hasFocus) {
           if (value instanceof MyNode) {
             final MyNode node = ((MyNode) value);
             setIcon(node.getIcon(expanded));
             final Font font = UIUtil.getTreeFont();
             if (node.isDisplayInBold()) {
               setFont(font.deriveFont(Font.BOLD));
             } else {
               setFont(font.deriveFont(Font.PLAIN));
             }
             append(
                 node.getDisplayName(),
                 node.isDisplayInBold()
                     ? SimpleTextAttributes.REGULAR_BOLD_ATTRIBUTES
                     : SimpleTextAttributes.REGULAR_ATTRIBUTES);
           }
         }
       });
   initToolbar();
   ArrayList<AnAction> actions = createActions(true);
   if (actions != null) {
     final DefaultActionGroup group = new DefaultActionGroup();
     for (AnAction action : actions) {
       group.add(action);
     }
     actions = getAdditionalActions();
     if (actions != null) {
       group.addSeparator();
       for (AnAction action : actions) {
         group.add(action);
       }
     }
     PopupHandler.installPopupHandler(
         myTree,
         group,
         ActionPlaces.UNKNOWN,
         ActionManager.getInstance()); // popup should follow the selection
   }
 }
  private void initTree() {
    myTree.setRootVisible(false);
    myTree.setShowsRootHandles(true);
    SmartExpander.installOn(myTree);
    TreeUtil.installActions(myTree);
    EditSourceOnDoubleClickHandler.install(myTree);
    myTree.addKeyListener(
        new KeyAdapter() {
          @Override
          public void keyPressed(KeyEvent e) {
            if (KeyEvent.VK_ENTER == e.getKeyCode()) {
              TreePath leadSelectionPath = myTree.getLeadSelectionPath();
              if (leadSelectionPath == null) return;

              DefaultMutableTreeNode node =
                  (DefaultMutableTreeNode) leadSelectionPath.getLastPathComponent();
              if (node instanceof UsageNode) {
                final Usage usage = ((UsageNode) node).getUsage();
                usage.navigate(false);
                usage.highlightInEditor();
              } else if (node.isLeaf()) {
                Navigatable navigatable = getNavigatableForNode(node);
                if (navigatable != null && navigatable.canNavigate()) {
                  navigatable.navigate(false);
                }
              }
            }
          }
        });

    TreeUtil.selectFirstNode(myTree);
    PopupHandler.installPopupHandler(
        myTree, IdeActions.GROUP_USAGE_VIEW_POPUP, ActionPlaces.USAGE_VIEW_POPUP);
    // TODO: install speed search. Not in openapi though. It makes sense to create a common
    // TreeEnchancer service.
  }