How to Remove expnsion for JTree?

Hi ALL,
I have a JTree with Basic Nodes with sub nodes as null. I would like to add sub tree for each node after click on the node. I am able to add the sub tree after click on the node. With out click on node, if i expand the node, null node is displaying. I would like to restrict the user to expand the node but click on node has to add the sub tree. How to restrict the user to expand the node? How to achieve this?
If i write the listner for RemoveTreeExpand, will it allows to add sub tree and expand the sub tree?
Thank you.

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