Opening a tree structure without clicking

Dear friends i have asked this question before but i can get no exact answer. I have an DefaultMutableTreeNode objects which are displayed as a tree structure on a GUI. As you normally know , in order to see the branches of a tree you should click on the tree. But i want to open that tree structure ( which was constructed with DefaultMutableTreeNode objects ) without clicking on it.

CeciNEstPasUnProgrammeur . Dear friend , i am new on
java. i am waiting help in this forum, but i can not
understand your behaviour.It's very simple:
- give someone a valid reply to a valid question
- see the person post the question again. See other people giving the same replies
- see the person posting the question a third time.See more people wating their time giving replies that were already given before
- see the person refuse to believe that all replies given are correct
- think that the person is a bit dense, ignoring the only true replies and hoping for a miracle solution
After that, you start to behave like I do.
If it's about the "huh": that's the usual behaviour you get from people when you confront them with gibberish.

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