JScrollPane + Component sizes before display

I was recently presented with a minor quandry.
I have a JPanel which needs to occupy a minimum fixed amount of real estate on my application's GUI, call it 'checkbox_jpanel'. The problem is that as the user operates the application, more and more checkboxes will be added to it. This works fine until I reach the size limit of the JPanel.
The obvious solution seemed to be to use a JScrollPane, and simply tuck the checkbox_jpanel inside of it. That way, I could dynamically resize the JPanel, and the JScrollPane could take care of displaying it.
Simple, until I realized that there's no good way to ask a layout manager how much space it had planned to let a given component take up, including buffer pixels. I can't even ask the component itself because, having not yet been drawn, it doesn't know how big it is either.
Currently, I'm able to get this strategy to work by guessing - eyeballing the number of pixels + space - each new checkbox takes up for the height * the number of items, and the width is based on the largest constant + (constant-intended-to-represent-average-character-width*letters in text portion of checkbox) among the set of checkboxes. I use that width and height to set the preferredSize of the JPanel i'm actually adding to.
I wince when I look at that code.
The comment above it says "This really needs to be done correctly."
How could I do this 'correctly' ?
The only thing I've been able to come up with is almost as ugly; make the checkbox_jpanel some insanely large size that will always encompass EVERYTHING, insuring that the checkboxes will be drawn, force/wait for the redraw, and then recalculate the width/height, and reset the panel to the desired (correct) width and height. I don't know if I could get this done without a bit of flickering, and really, everything about it screams 'non-optimal solution'.
Any thoughts?

Just an idea: the sizes become calculated when the components become visible OR when the application frame is packed... perhaps you could use a call to pack(), then do your job, then finally show your frame ?

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