@Override
      public void treeExpanded(TreeExpansionEvent event) {
        DefaultMutableTreeNode expandedNode = (DefaultMutableTreeNode)event.getPath().getLastPathComponent();
        for (int i = 0; i < expandedNode.getChildCount(); i++) {
          DefaultMutableTreeNode child = (DefaultMutableTreeNode)expandedNode.getChildAt(i);
          if (child.getChildCount() == 0 && !isLooped(event.getPath(), child)) {
            Module module = ((MyUserObject)child.getUserObject()).myModule;
            for (Module dependency : getModuleDependencies(module)) {
              child.add(new DefaultMutableTreeNode(new MyUserObject(isInCycle(dependency), dependency)));
            }
            TreeUtil.sortRecursively(child, NODE_COMPARATOR);
          }
        }
      }
@Override
      public void treeExpanded(TreeExpansionEvent event)