private void detach_RbActivities_ModifyPersonId(RbActivity entity)
 {
     this.SendPropertyChanging("RbActivities_ModifyPersonId");
     entity.Person_ModifyPersonId = null;
 }
 private void attach_RbActivities_CreatePersonId(RbActivity entity)
 {
     this.SendPropertyChanging("RbActivities_CreatePersonId");
     entity.Person_CreatePersonId = this;
 }