JTREE: Custom TreeModel does not update non-root nodes

I have a JTree that uses a custom TreeModel that wraps over (delegates to) a data class X which keeps track of all its children. The class X maintains its own data structure internally (references to other data objects). It also implements 'equals' and 'hashcode' methods. When the data changes in X, it invokes fireTreeStructureChanged on the TreeModel. (There is a TreeModelListener registered with the TreeModel). This works very well for the root node but not for the other non-root nodes. The JTree correctly calls 'equals' and I can see that equals returns 'false' but for non-root nodes the JTree does not refresh though I can see the underlying data structure has changed.
I am wondering if I may not have fully & correctly implemented fireTreeStructureChanged as it doesn't seem to do much. Or I may be looking at the wrong place. Any pointers would be appreciated.
BTW, this question is very similar to one asked years earlier http://forums.sun.com/thread.jspa?threadID=153854 but it didn't help me :(
Thanks.
ps: working with jdk1.6.0_06 on WinXP.

I have a same problem. I got an error "Cannot Update Libray".

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