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.
  }
  public ActionsTree() {
    myRoot = new DefaultMutableTreeNode(ROOT);

    myTree =
        new Tree(new MyModel(myRoot)) {
          @Override
          public void paint(Graphics g) {
            super.paint(g);
            Rectangle visibleRect = getVisibleRect();
            Rectangle clip = g.getClipBounds();
            for (int row = 0; row < getRowCount(); row++) {
              Rectangle rowBounds = getRowBounds(row);
              rowBounds.x = 0;
              rowBounds.width = Integer.MAX_VALUE;

              if (rowBounds.intersects(clip)) {
                Object node = getPathForRow(row).getLastPathComponent();

                if (node instanceof DefaultMutableTreeNode) {
                  Object data = ((DefaultMutableTreeNode) node).getUserObject();
                  Rectangle fullRowRect =
                      new Rectangle(
                          visibleRect.x, rowBounds.y, visibleRect.width, rowBounds.height);
                  paintRowData(this, data, fullRowRect, (Graphics2D) g);
                }
              }
            }
          }
        };
    myTree.setRootVisible(false);
    myTree.setShowsRootHandles(true);

    myTree.putClientProperty(WideSelectionTreeUI.STRIPED_CLIENT_PROPERTY, Boolean.TRUE);
    myTree.setCellRenderer(new KeymapsRenderer());
    myTree.addMouseMotionListener(
        new MouseMotionAdapter() {
          @Override
          public void mouseMoved(MouseEvent e) {
            String description = getDescription(e);
            if (description != null) {
              ActionMenu.showDescriptionInStatusBar(true, myTree, description);
            } else {
              ActionMenu.showDescriptionInStatusBar(false, myTree, null);
            }
          }

          @Nullable
          private String getDescription(@NotNull MouseEvent e) {
            TreePath path = myTree.getPathForLocation(e.getX(), e.getY());
            if (path == null) return null;

            DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
            if (node == null) return null;

            Object userObject = node.getUserObject();
            if (!(userObject instanceof String)) return null;

            String actionId = (String) userObject;
            AnAction action = ActionManager.getInstance().getActionOrStub(actionId);
            if (action == null) return null;

            return action.getTemplatePresentation().getDescription();
          }
        });

    myTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);

    myComponent =
        ScrollPaneFactory.createScrollPane(
            myTree,
            ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
            ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
  }