Added prototype for DlgObj_ConvertToWindow().
diff --git a/Mac/Include/pymactoolbox.h b/Mac/Include/pymactoolbox.h
index 79b8f0e..39dffab 100644
--- a/Mac/Include/pymactoolbox.h
+++ b/Mac/Include/pymactoolbox.h
@@ -32,6 +32,7 @@
 /* Dlg exports */
 extern PyObject *DlgObj_New(DialogPtr);
 extern int DlgObj_Convert(PyObject *, DialogPtr *);
+extern WindowPtr DlgObj_ConvertToWindow(PyObject *);
 extern PyTypeObject Dialog_Type;
 #define DlgObj_Check(x) ((x)->ob_type == &Dialog_Type)