public void DeleteReference(ReferenceEditViewModel reference)
 {
     References.Remove(reference);
     model.References.Remove(reference.Model);
 }
        void AddReference()
        {
            var reference = new ReferenceEditViewModel(this, new ReferenceEdit());
            var message = new EditReferenceMessage(reference);
            Messenger.Send(message);
            if (message.Result != true) return;

            model.References.Add(reference.Model);
            References.Add(reference);
        }