This seems like it should be a simple question, but I can't figure out how
to get a scroll bar in a gui application like this one:

#lang racket/gui
> (define frame
>   (new frame% [label "Example"]))
> (for ([letter '("A" "B" "C" "D")])
>   (define grp
>     (new group-box-panel%
>          [parent frame]
>          [label letter]))
>   (for ([i (in-range 0 10)])
>     (new button%
>          [parent grp]
>          [label (number->string i)])))
> (send frame show #t)

I can see something like what I have in mind in Dr. Racket's
"Colors">"Color Schemes" preferences tab (at least on Mac OS), but I can't
figure out how to do it.


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