public void attachToMovingGrabPoint(OffsetGrabPoint gp){
  gp.addGrabPoint(gpo);
}

public void attachToMovingGrabPoint ( OffsetGrabPoint gp ) { gp . addGrabPoint ( gpo ) ; }
attach to the moving offsetgrabpoint so if it moves , it will move this editableomgraphic with it . editableomgraphic version doesn ' t do anything , each subclass has to decide which of its offsetgrabpoints should be attached to it .
