void ObjectSpaceOnObjectChanged(object sender, ObjectChangedEventArgs objectChangedEventArgs)
 {
     if (objectChangedEventArgs.PropertyName != LockedUser)
     {
         if (_pessimisticLocker.IsLocked)
         {
             View.AllowEdit[PessimisticLocking] = false;
         }
         else
         {
             _pessimisticLocker.Lock();
         }
     }
 }