constraint.AddSource( LocalSource(Actor::Property::PARENT_ORIGIN) );
constraint.AddSource( LocalSource(Actor::Property::ANCHOR_POINT) );
constraint.AddSource( ParentSource(Actor::Property::SIZE) );
constraint.AddSource( LocalSource(Actor::Property::PARENT_ORIGIN) );
constraint.AddSource( LocalSource(Actor::Property::ANCHOR_POINT) );
constraint.AddSource( ParentSource(Actor::Property::SIZE) );