实现MFC位图按钮，可以加载按下位图和光标在按钮上时的位图，只需调用一个函数，方便使用-Achieve MFC bitmap button, you can load a bitmap and press the button when the cursor bitmap, just call a function, easy to use

使用MFC中的CBitmapButton来加载对应的位图。-CBitmapButton use MFC to load the corresponding bitmap.

VC6.0MFC编程——图片Button。即改变控件的背景为图片，使Button变得更好美丽好看！-Visual C++ MFC program,New form of the Button,that is BitmapButton! You may find it s useful!