说明：  基于MFC，完全兼容CButton类。实现按钮的自定义图标显示、提示信息、背景自定义、文本自定义、按钮区域根据图形的前景图片显示等等的功能。
(MFC-based, fully compatible CButton category. Since achieving the button icon definition, a message, from the definition of background, text from the definition graphics buttons region under the prospects for pictures, etc. function.)