让CButtonST 类支持鼠标掠过时发声
................................\BCMenu.cpp
................................\BCMenu.h
................................\BtnST.cpp
................................\BtnST.h
................................\res
................................\...\ringin.wav

................................\...\test.rc2
................................\Resource.h
................................\StdAfx.cpp
................................\StdAfx.h
................................\test.clw
................................\test.cpp
................................\test.dsp
................................\test.dsw
................................\test.h
................................\test.opt
................................\test.rc
................................\testDlg.cpp
................................\testDlg.h