Default Expand/Collpase not working in adf's af:tree component

Question

Hi,
I have a tree problem with a default events of expand/collapse.
I have a PathSet variable in the bean which I have linked to the treeState of af:tree in the jsp.
So, the page opens up with all the nodes expanded, but when I click on any of them, the tree doesn't collapse. I dont handle the DisclosureEvent since I thought that only customizes the event handling. If I dont link to the PathSet variable, then the page opens with all the nodes collapsed and the expand action doesn't work. I've tried with both request and session scoped beans, but it doesnt help. Any pointers will be greatly appreciated, have read the docs, but the problem remains.
Snippet of code:
dialogPage.jsp:
<af:tree value="#{backing_dialogpage.model}" var="row"
binding="#{backing_dialogpage.tree1}" id="tree1">
<f:facet name="nodeStamp">
<af:selectBooleanCheckbox label="#{row.strName}"/>
</f:facet>
<f:facet name="pathStamp">
<h:outputText value="#{row.strName}"/>
</f:facet>
</af:tree>
(backing bean)Dialogpage.java - constructor
public Dialogpage () {
TableRow root1 = new TableRow ("1994");
TableRow child1 = new TableRow("child1_cruise_id_101");
TableRow child2 = new TableRow("child2_cruise_id_202");
List childList = new ArrayList();
childList.add(child1);
childList.add(child2);
root1.setChildren(childList);
this.rootList.add(root1);
this.rootList.add(new TableRow("1996"));
this.model = new ChildPropertyTreeModel(rootList,"children");
this.path = new PathSet (true);
}

Answer 1

The logic here is pretty similar to the one with folders and files. Folders are container types and files are just leaf nodes (can't contain other files).
I don't want under each folder node to have two new container nodes - one that hold other subfolders, and another one that hold just files. And that's just what I get now.
How to avoid that?
Anybody?