Update JScrollBar Extent when JScrollPane Component Changes Preferred Size

Hi folks,
I have an interesting, but concise problem that I've been working on for a few days but haven't had any luck.
In Java 1.5 or Java6, I have a JScrollPane which contains a JPanel. The settings of the scrollbar (for example, the Extent [the width of the "thumb" or "slider" on the scrollbar]) are determined based on the dimension of the underlying contained component, in particular, the Preferred Size.
My problem is this. The underlying component has a "zoom" capability, such that the actual size of the component can and does change (i.e., zooming out reduces its preferred size).
Happily, the consequence of this design is that the "size" or extent of the scrollbar sliders/thumbs adjusts to give visual indication of the proportion of the current view (ViewPort View dimension) to the underlying component's dimension.
The problem is, the scrollbar sliders do NOT automatically update their size in response to programatically changing the JScrollPane's contained component's PreferredSize. They WILL be updated if I RESIZE the parent JFrame manually.
But for the life of me, I can't get those sliders to update programatically. I've tried repaint(), update, validate(), etc. on the JScrollPane but no luck.
I've done a debug to get into the stack trace of the Sun code during run time, and there's a lot going on... there's a doLayout(), a reshape() (deprecated), firing various property changes, but I just can't seem to find a good hook into getting the scrollbar to update its internal Bounds model and repaint accordingly. Calling setBounds() on the JScrollPane I think would trigger it, however, looking at the code.. it seems to ignore firing property events and repainting of the bounds themselves didn't actually change (i.e. no action happens if the current dimension and specified dimension in the argument to setBounds() are the same).
Any ideas here on how to this to get those sliders to update programatically with a new value for the extent?
Thanks,
--Mike

Understood! It was my intention to give credit and now I'm happy to do so! I've now assigned the Duke Points. Minor usability issue, it was not obvious how to do this the first time (and I did poke around a little before I gave up earlier in the day, reverting to just assigning him the correct question). I've got it now though! Thanks again--definitely knocked out an issue I was having today and allowed me to move on to add'l development work today.
All the best!
--Mike

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