The style of the widget seems to be the cause of my problem. All other styles I tried (CDE, Motif, Cleanlooks, Windows) seem to work as expected, giving me the solid color background I expected. Only Plastique seems to have the issue described in this thread.
So I have a way to accomplish what I need but now the question becomes..
Why does the plastique style override what I put in the StyleSheet and force it to be a gradient when I specify a single color?
Thanks for a push in the right direction!
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