what is up with flip controls. I am working on a door family, and I want the door to flip about a certain ref plane, so that is stays anchored in masonry. the door is going into a furred wall with 7-5/8" masonry and 6-5/8" furring and substrate. I want the door to stay in the masonry no matter if it swinging in or out of a room. how do you define the boundary for a flip control in a family?