code: public Model[] getModels() {
      Collection<Key<Model>> modelKeys = _models.values();
      Model[] models = new Model[modelKeys.size()];
      int i = 0;
      for (Key<Model> mKey : modelKeys) {
        models[i] = mKey != null ? mKey.get() : null;
        i++;
      }
      return models;
    }
docs: Return all models included in this grid object.
  
  @return all models in this grid