public void AddSubButton(IButtonInfo button)
        {
            _btn.ItemLinks.Add(button.Button as BarButtonItem);
            _SubButtons.Add(button);
        }

        /// <summary>
        /// 查找子按钮
        /// </summary>
        /// <param name="owner"></param>
        /// <param name="name"></param>
        /// <returns></returns>
        public static IButtonInfo FindSubitem(this IButtonInfo owner, string name)
        {
            NullButton result = new NullButton();
            if (owner.SubButtons == null || owner.SubButtons.Count == 0) 
                return result;
            var btn = owner.SubButtons.Where(w => w.Name.ToUpper() == name.ToUpper()).FirstOrDefault();
            return btn == null ? result : btn;
        }

        public override void SetLanguage()
        {
            base.SetLanguage();

            var btnOwner = _buttons.GetButtonByName(ButtonNameList.btnExportDataDict);

            btnOwner.FindSubitem("btnExportFile").Caption = LanLib.Get("导出模版文件");
            btnOwner.FindSubitem("btnImportFile").Caption = LanLib.Get("导入模版数据");
        }