propagate ProcessMessages. There are still some cases where we're

handling children directly; as those come up, they'll either propagate this
message or (preferably) be converted to use AddChild and let ActorFrame
do the work.

stepmania/src/ActorFrame.cpp

@@ -228,6 +228,18 @@ void ActorFrame::UpdateInternal( float fDeltaTime )
 	}
 }
 
+void ActorFrame::ProcessMessages( float fDeltaTime )
+{
+	Actor::ProcessMessages( fDeltaTime );
+
+	// update all sub-Actors
+	for( vector<Actor*>::iterator it=m_SubActors.begin(); it!=m_SubActors.end(); ++it )
+	{
+		Actor *pActor = *it;
+		pActor->ProcessMessages( fDeltaTime );
+	}
+}
+
 #define PropagateActorFrameCommand( cmd ) \
 	void ActorFrame::cmd()				\
 	{									\