rich:tree question, how to select a tree node and how to dis

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1. how to make a tree disabled (you can see it but can't expand or collapse it.
2. how to programmticaly select a tree node.

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I use the binding to bind my tree to my bean. and I did the following to select a specific tree node.

 public void expandTemplateTree(ActionEvent evt) {
 try {
 TreeState ts = (TreeState)templateTree.getComponentState();
 ts.expandAll();
 ListRowKey key = getRowKey(templateRoot, this.templatePath);
 boolean is = ts.isSelected(key);
 boolean result = ts.setSelected(key);
 is = ts.isSelected(key);
 ts.saveState( FacesContext.getCurrentInstance() );
 //this.templateTree.queueExpandAll();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }

I can see that after ts.setSelected(key);
the ts.isSelected(key) returned "true",
but after reRender the tree, the tree is expanded but the tree node is not shown as selected.

Please help.