List list = treeModel.getService().invokeSelect(instanceUid);
addListforNew(list, treeModel);
StringBuffer buffer = new StringBuffer();
buffer.append("<tree>\n");
DOTreeModel childModel = (DOTreeModel) treeModel.getChildren()
.toArray()[0];
dealChildOneHelper(treeModel, instanceUid, list, buffer, childModel);
buffer.append("</tree>\n");
return buffer.toString();
}