private void btn_add_Click(object sender, RoutedEventArgs e)
        {
            mWarnningDataSource = WarnningDataSource.GetInstance();
            mStatusMap          = mWarnningDataSource.mStatusMap;


            WarnningDataSource.ErrorInfo info = new WarnningDataSource.ErrorInfo()
            {
                level = 202, description = "add test"
            };

            int count = mWarnningDataSource.GetWarnningCount();

            //test add to list
            mListError.Add(null);
            mWarnningDataSource.AddWarningItem(info);
            count = mWarnningDataSource.GetWarnningCount();

            PageDataExchange context = PageDataExchange.getInstance();

            context.NotifyObserverChanged(PageWarnningHeader.TAG, WarnningDataSource.TAG, info);
        }
        //override
        public void onRecieveResult(Dictionary <String, Object> bundle)
        {
            Object senderName;
            Object resultValue;
            Object senderValue;

            bundle.TryGetValue(PageDataExchange.KEY_SENDER_NAME, out senderName);
            bundle.TryGetValue(PageDataExchange.KEY_RESULT_VALUE, out resultValue);
            bundle.TryGetValue(PageDataExchange.KEY_SENDER_VALUE, out senderValue);

            //beckhoff changed
            if (WarnningDataSource.TAG.Equals(senderName))
            {
                WarnningDataSource.ErrorInfo infoChanged = (WarnningDataSource.ErrorInfo)senderValue;
                WarnningDataSource.ErrorInfo infoCurrent = (WarnningDataSource.ErrorInfo) this.cb_info.SelectedItem;
                WarnningDataSource           data        = WarnningDataSource.GetInstance();


                //if (data.IsWarnningAdded(infoChanged))
                //{
                //    //this.cb_info.SelectedItem = infoChanged;

                //}
                //else if (infoCurrent != null && infoChanged.level == infoCurrent.level)// item was removed
                //{
                //    if (this.cb_info.SelectedIndex > 0)
                //    {
                //        this.cb_info.SelectedIndex = 0;
                //    }
                //}

                PageDataExchange   context    = PageDataExchange.getInstance();
                WarnningDataSource dataSource = WarnningDataSource.GetInstance();
                if (dataSource.GetWarnningCount() == 0 && context.IsPageLoaded(PageWarningDetail.TAG))
                {
                    Utils.NavigatePageBack();
                }

                this.cb_info.ItemsSource = data.GetWarnningList();
                this.cb_info.Items.Refresh();
                this.cb_info.SelectedIndex = 0;
            }
        }