-ADD_ACKNOWLEDGER (Grace_beam_engraver, stem);
-ADD_ACKNOWLEDGER (Grace_beam_engraver, rest);
+
+void
+Grace_beam_engraver::boot ()
+{
+ ADD_LISTENER (Grace_beam_engraver, beam);
+ ADD_ACKNOWLEDGER (Grace_beam_engraver, stem);
+ ADD_ACKNOWLEDGER (Grace_beam_engraver, rest);
+}