How to add nodes to a tree using Ajax

[Kai Schubert-Altmann]

Hi,

how can I add nodes to a wicket tree using a AjaxLink?

I tried to add a node to the SimpleTree of this example:
http://www.wicket-library.com/wicket-examples/ajax/tree/simple.1

with this code:

        add(new AjaxLink("addNode")
        {
            public void onClick(AjaxRequestTarget target)
            {
              List list = new ArrayList();
              list.add("new node");
              BaseTreePage.this.add(rootNode,list);
              getTree().updateTree(target);
            }
        });

But the tree will not update itself.

Thanks in advance,
Kai