I see scroll bars, and scroll buttons are mentioned in the Palm OS User Interface guidlines, but I can't find any other reference to them.
A scroll button is just a borderless repeating button using the Symbol font that has either the UP or DOWN triangle characters.
In PilRC, you'd write something like
REPEATBUTTON "\x01" ID UpButton AT (147 144 13 8) NOFRAME FONT 5 REPEATBUTTON "\x02" ID DownButton AT (147 152 13 8) NOFRAME FONT 5
-- Ben Combee, DTS technical lead, PalmSource, Inc. Read "Combee on Palm OS" at http://palmos.combee.net/
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