cwbbutton是WindowBlinds像可调整大小的图像按钮从CButton的…

代码说明：

CWBButton is a WindowBlinds like resizable image button derived from a CButton. In MFC, You can use the class called CBitmapButton, but that s not enough. The size of button is the size of the bitmap, and you can t put a text by calling the API SetWindowText(). I wanted REAL Bitmap Button like GTK+ or WindowBlinds. So I try to create a REAL Bitmap Button referring WindowBlinds.