public static DefaultMutableTreeNode createNode(Group group) {
    DefaultMutableTreeNode node = new DefaultMutableTreeNode(group);
    for (Object child : group.getChildren()) {
      if (child instanceof Group) {
        DefaultMutableTreeNode childNode = createNode((Group)child);
        node.add(childNode);
      }
      else {
        LOG.assertTrue(child != null);
        node.add(new DefaultMutableTreeNode(child));
      }
    }
    return node;
  }
public static DefaultMutableTreeNode createNode(Group group)