overrid set enclos fig fig enclos layer perspect layer layer perspect layer layer like delet layer set enclos fig enclos model facad state vertex owner object state vertex owner object composit state enclos model facad composit state enclos owner composit state enclos owner fig state vertex enclos redraw enclos fig composit state model state machin helper model state machin helper state machin state vertex composit state chang model unless need avoid issu model facad contain state vertex composit state model state machin helper set contain state vertex composit state 