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How to hide a tree node from the GUI, URGENT!

 
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Hi, All
I used a JTree in my project in which I have a DefaultTreeModel to store all the tree structure and a JTree show it on the screen. But for some reason, I want to hide some of the nodes from the user, but I don't want to remove them from the tree model because later on I still need to use them.
How can I hide some of the tree node from the user? Thanks for any information.
Linda
 
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