Cannot expand tree nodes using t:tree tag

Hi, I have a question.
I am a beginner of JSF. I am trying to deploy a very simple tree using <t:tree> in my local tomcat server, similar to the following one:
http://www.irian.at/myfaces/tree.jsf
The result is that the tree is properly displayed, but I cannot expand the nodes when I click on the "+" icon of the nodes.
Can someone help me? Thanks a lot!

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