SplitButton an XP style dropdown split button_ Free source code and programming

在vc++环境下，基于MFC的不规则形状按钮，计算器，切分窗口，用OpenGL实现简单动画和制作可扩展对话框-In vc++ Environment, based on the MFC of the irregular shape of the button, calculator, split window, using OpenGL to achieve a simple animation and production scalability of the dialog box