-void PoetryError(wxChar *, wxChar *caption=_T("wxPoem Error"));
-void PoetryNotify(wxChar *Msg, wxChar *caption=_T("wxPoem"));
+void PoetryError(const wxChar *, const wxChar *caption=_T("wxPoem Error"));
+void PoetryNotify(const wxChar *Msg, const wxChar *caption=_T("wxPoem"));