this.listSelectObjects.Clear();

            foreach (var item in TradeModelManager.Instance.DescriptolList)

            {

                this.listSelectObjects.Add(new SelectObject(item.Name,item));

            }

            TreeNode node = this.SelectedItem as TreeNode;

            if (node!=null)

            {

                bool flag = false;

                foreach (var item in TradeModelManager.Instance.DescriptolList)

                {

                    if (item==node.Tag)

                    {

                        flag = true;

                        break;

                    }

                }

                if (!flag)

                {

                    this.SelectedItem = null;

                }

            }