How do I remove expand / collapse icon for JTree empty folders

Hi
I am using a JTree as a file system browser. I use DefaultMutableTreeNode nodes.
I have a problem with empty folders.
Empty folders show the expand / collapse icon, leading the user to believe there are sub-directories. When the user double-clicks the folder, the expand / collapse icon goes away. This is a "haha-gotcha" glitch that I really don't want my users to have to continually deal with.
So, how might I get my JTree to not show the expand / collapse icon for empty folders?
Thanks
Wayne

Maybe I can use the FileSystemView isTraversable(File f) method in my TreeCellRenderer class to check if anything is in the directory.
But I still need to know how to disable the expand / collapse icon for such a node.

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