This functionality is supported only if you are using the Classic Agent.
Silk Test Classic does not record ChevronClick() against the JavaSwtRichPageList class; you must add it by hand to your test script. Silk Test Classic only records Select statements against the JavaSwtRichPageList class.
If the pagelist does not have a chevron, ChevronClick returns an exception, E_WINDOW_TYPE_MISMATCH.