1、Button控件鼠标事件执行顺序
(1) WM_LBUTTONDOWN
(2) WM_LBUTTONUP
(3) OnBnClickedButton1();
2、Picture Control的鼠标事件执行顺序
(1) WM_LBUTTONDOWN
(2) OnStnClickedStaticSpeak()
(3) WM_LBUTTONUP
【MFC】Button控件和Picture Control的鼠标事件执行顺序
原文：http://www.cnblogs.com/happykoukou/p/6237110.html