We found that SelectItem method setPickListBaseStyle() does not seem to be working anymore in 13.0p skins, either custom or standard (Tahoe for example).
The resulting HTML has just class="pickListCell" (which is the default), not the expected class="custom1 custom2 pickListCell".
Code:
SelectItem item = new SelectItem(); item.setPickListBaseStyle("custom1" + " " + "custom2" + " pickListCell");
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