怎么使基于MFC的对话框程序启动时最小化？如下代码不能实现，为什么

如何使基于MFC的对话框程序启动时最小化？如下代码不能实现，为什么？

BOOL   CClocktimeApp::InitInstance()
{
if(++g_lAppInstance> 1)
{
AfxMessageBox( "程序已经运行! ");
return   FALSE;
}


AfxEnableControlContainer();

//   Standard   initialization
//   If   you   are   not   using   these   features   and   wish   to   reduce   the   size
//     of   your   final   executable,   you   should   remove   from   the   following
//     the   specific   initialization   routines   you   do   not   need.

#ifdef   _AFXDLL
Enable3dControls(); //   Call   this   when   using   MFC   in   a   shared   DLL
#else
Enable3dControlsStatic(); //   Call   this   when   linking   to   MFC   statically
#endif

CClocktimeDlg   dlg;
m_pMainWnd   =   &dlg;        
int   nResponse   =   dlg.DoModal();
ShowWindow(GetMainWnd()-> GetSafeHwnd(),SW_HIDE);   //使窗口最小化
if   (nResponse   ==   IDOK)
{
//   TODO:   Place   code   here   to   handle   when   the   dialog   is
//     dismissed   with   OK
}
else   if   (nResponse   ==   IDCANCEL)
{
//   TODO:   Place   code   here   to   handle   when   the   dialog   is
//     dismissed   with   Cancel
}

//   Since   the   dialog   has   been   closed,   return   FALSE   so   that   we   exit   the
//     application,   rather   than   start   the   application 's   message   pump.

return   FALSE;
}


------解决方案--------------------
m_pMainWnd -> ShowWindow(SW_HIDE);
------解决方案--------------------
这样写ShowWindow根本没有在对话框显示时执行
ShowWindow写到 ClocktimeDlg.cpp中去


------解决方案--------------------
还要在ON_SIZE消息的响应函数中添加 m_pMainWnd -> ShowWindow(SW_HIDE);
不然对话框还是会出来.
------解决方案--------------------
SW_HIDE似乎也不是最小化,而是隐藏窗口,最小化是SW_MINIMIZE