update; one shortcoming of this scheme is that bound objects need to know the

highest base class that also binds; if you're too high and there's no binding,
it'll cause a link error, but if you're too low you'll lose the methods in the
screens in between

stepmania/src/ScreenPlayerOptions.cpp

@@ -220,7 +220,7 @@ public:
 	}
 };
 
-LUA_REGISTER_DERIVED_CLASS( ScreenPlayerOptions, ActorFrame )
+LUA_REGISTER_DERIVED_CLASS( ScreenPlayerOptions, ScreenWithMenuElements )
 // lua end
 
 /*