Displaying leaf nodes at the bottom of a tree that has parent nodes

I have a problem in that - leaf nodes added to the tree at the bottom appear with big spaces (vertically) between them. It looks as if the nodes are somehow expanded by default!
Is this a known issue with leaf nodes that are added in below parent nodes?
I notice in the normal hierarchy the leaf nodes are displayed fine. Also if I return false on isleaf() it displays the last 3 nodes as expandable icons but they're still lage gaps between them.
this is an example of what i'm getting
Main �
+Parent Node(expandable)
|
+Parent Node(expandable)
|
+Parent Node(expandable)
|
|
|_leaf node (not expandable)
|
|
|_leaf node (not expandable)
|
|
|_leaf node (not expandable)

You got my interest with your topic subject as I'm working on a library which simplifies the development with Swing trees. However everyone here except you knows nothing about your "anormal hierarchy" which creates you problem.
Denis Krukovsky
http://sourceforge.net/projects/dotuseful/

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Displaying leaf nodes at the bottom of a tree that has parent nodes

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