アイテムのモデルを扱うService
        private void addButton_Click(object sender, RoutedEventArgs e)
        {
            this.SearchWordBox.Text = "";

            var service = new ItemModelService();
            var newModel = service.AddNewItem();

            _model.Select(newModel);
        }
        private bool ExpandItemModel()
        {
            var service = new ItemModelService();
            foreach (var model in LoadComposition.ItemModelCollection)
            {
                service.AddItem(model);
            }

            return true;
        }
 /// <summary>
 /// アイテムの転送
 /// </summary>
 /// <param name="items">アイテム</param>
 private static void TransferItems(List<ItemModel> items)
 {
     var service = new ItemModelService();
     foreach (var model in items)
     {
         service.AddItem(model);
     }
 }