ListGrid alternate column style

Is there a way to set an alternate column style? How about setting an alternate column style for columns spanned by a header?

I figure I’ll need to use setCellFormatter and test for modulo == 0 on the incoming column index and then set the style. Which is fine for individual columns, but won’t work for styling several columns that are spanned by a header.

I wound up ditching the SmartGWT ListGrid and using the SmartClient CubeGrid, which provided the functionality I needed.