#include "wx/defs.h"
#include "wx/toplevel.h"
-class WXDLLEXPORT wxSizer;
-class WXDLLEXPORT wxStdDialogButtonSizer;
+class WXDLLIMPEXP_FWD_CORE wxSizer;
+class WXDLLIMPEXP_FWD_CORE wxStdDialogButtonSizer;
#define wxDIALOG_NO_PARENT 0x0001 // Don't make owned by apps top window