JTree display: vertical connecting lines missing

My JTree uses a subclass of TreeModel to display the contents of a DOM tree and to allow modifications on this tree. I've got a problem with the rendering of the tree: the vertical connecting lines don't show.. (also there seems to be problems with the refreshing of the tree display, even though TreeModelEvents are fired properly, but it might not be related.)
The problem originates from the TreeModel subclass (other models worked fine), but I can't tell what exactly in the class causes it. I've tried to remove code, etc.. with no effect.
Has anyone encountered something similar?
Thanks in advance.
Simon

yeah... that's common in jtrees that do not refresh well... you know that something is wrong when the lines have dissappeared.
when i encountered this problem what i did was to copy the lines from DefaultTreeModel sourcecode where the model is refreshed into my code... that worked fine for me...

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