如何改变窗口的缺省风格?

重载 CWnd:: PreCreateWindow 并修改CREATESTRUCT结构来指定窗口风格和其他创建信息.
 Example: Delete "Max" Button and Set Original
Window's Position and Size

 BOOL CMainFrame:: PreCreateWindow
(CREATESTRUCT &cs)
 {
 cs.style &=~WS_MAXINIZEMOX

 cs.x=cs.y=0
 cs.cx=GetSystemMetrics(SM_CXSCREEN/2)
 cs.cy=GetSystemMetrics(SM_CYSCREEN/2)

 return CMDIFramewnd ::PreCreateWindow(cs)
 }