HHOOK g_Hook = NULL;
LRESULT CALLBACK CallWndRetProc(int nCode, WPARAM wParam, LPARAM lParam)
{
   LRESULT retval = CallNextHookEx(0, nCode, wParam, lParam);
   if ( nCode == HC_ACTION ) {
      CWPRETSTRUCT *msg = (CWPRETSTRUCT *)lParam;
      if ( msg->message == WM_CONTROLCOLORSTATIC ) {
           ....................... TODO
      }
   }
   return retval;
}
int CMyApp::DoMessageBox(LPCTSTR lpszPrompt, UINT nType, UINT nIDPrompt) 
{
   g_Hook = ::SetWindowsHookEx(WH_CALLWNDPROCRET, CallWndRetProc, NULL, 
      ::GetCurrentThreadId());
   int nRet = CWinApp::DoMessageBox(lpszPrompt, nType, nIDPrompt);
   if (g_Hook) ::UnhookWindowsHookEx(g_Hook);
   return nRet; 
}

BOOL CALLBACK DialogProc(HWND hWnd, UINT uMsg, WPARAM wParam,
                         LPARAM lParam)
{
   switch(uMsg)
   {
      //...
      HANDLE_hWnd, WM_CTLCOLORMSGBOX, Dlg_OnCtlColorMsgBox;
   }
   return FALSE;
}
 
HBRUSH Dlg_OnCtlColorMsgBox(HWND hWnd, HDC hdc, HWND hWndChild,
                            int type)
{
   HBRUSH hbr = NULL;
   // Just for testing WM_CTLCOLORMSGBOX message.
   if(CTLCOLOR_MSGBOX == type)
   {
      // hbr = ... get a valid brush handle to return ...
      // But it NEVER enters here!!!
   }
   return hbr;
}

LRESULT CALLBACK CbtHookProc(int nCode, WPARAM wParam,
                             LPARAM lParam)
{
   if(nCode < 0)
   {
      return ::CallNextHookEx(cmbv.hHook, nCode, wParam, lParam);
   }
   switch(nCode)
   {
   case HCBT_CREATEWND:    // a window is about to be created
      {
         LPCBT_CREATEWND lpCbtCreate = (LPCBT_CREATEWND)lParam;
         if(WC_DIALOG == lpCbtCreate->lpcs->lpszClass)
         {
            // WC_DIALOG is the class name of message box but it
            // has not yet had a window procedure set.
            // So keep in mind the handle to sublass it later when
            // its first child is about to be created.
            cmbv.hWnd = (HWND)wParam;
         }
         else
         {
            if((NULL == cmbv.lpMsgBoxProc) && (NULL != cmbv.hWnd))
            {
               // subclass the dialog 
               cmbv.lpMsgBoxProc = 
                  (WNDPROC)::SetWindowLong(cmbv.hWnd, GWL_WNDPROC,
                     (LONG)CustomMessageBoxProc);
            }
         }
      }
      break;
   case HCBT_DESTROYWND:    // a window is about to be destroyed
      {
         if(cmbv.hWnd == (HWND)wParam)    // it's our messge box
         {
            // so set back its default procedure
            ::SetWindowLong(cmbv.hWnd, GWL_WNDPROC,
                            (LONG)cmbv.lpMsgBoxProc);
         }
      }
   }
   return 0;
}