v2.3: Where is the "fill style" of SimpleFillSymbol class?

Discussion created by wangzhifang-esrichina-com-cn-esridist on Dec 17, 2011
Latest reply on Dec 20, 2011 by wangzhifang-esrichina-com-cn-esridist
I've noticed on what's new document(, it mentioned that "SimpleFillSymbol added support for the following fill styles: BackwardDiagonal, ForwardDiagonal, Horizontal, and Vertical."
But I can't find it in code or online api reference...