Way to expanding jTree

before i add a new node to a jtree some nodes r expanded. so after i added the new node in the JTree i want to show the nodes that were previously expanded in the jtree. what is the way?
I am using,
model : DefaultTreeModel
tree : JTree
rootnode : DefaultMutableTreeNode
Now i am calling the model.reload() method. if the user is selected any node in the tree then i add the new node and call the reload, cause the cast cast exception: can't to cast MyObject to TreeNode. why?

Thank you very much Steve, I was able to integrate
your code in my own application. It's working fine.
I will do more tests with it and let you know about
it.That's terrific Andre. I am very pleased the code worked and helped you. I hope this solution 'nails' the much wondered about JTree refresh problem once and for all.
Should you come across any bugs, or if you think of any means of improvement during your testing, I would be very interested to hear from you.
In any case, good luck with your project, and all the best,
Steve

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