说明：  directxui的类继承图,是研究DIRECTUI的必备资料,由于是用VISIO画的,所以实线箭头表示继承,虚线剪头表示聚合.
(directxui class inheritance diagram, is to study the DIRECTUI essential information, because it is painted with VISIO, so the solid arrows indicate inheritance, dotted line cutting head, said polymerization.)