Index: defwnd.c
===================================================================
--- win32ss/user/user32/windows/defwnd.c	(revision 72147)
+++ win32ss/user/user32/windows/defwnd.c	(working copy)
@@ -173,7 +173,7 @@
   if (ISITHOOKED(WH_CBT))
   {
      NtUserMessageCall( hWnd, WM_SYSCOMMAND, wParam, lParam, (ULONG_PTR)&lResult, FNID_DEFWINDOWPROC, FALSE);
-     if (lResult) return 0;
+     return lResult;
   }
 
   switch (wParam & 0xfff0)