/// <summary>
 ///     增加条件
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void cmdAddCondition_Click(object sender, EventArgs e)
 {
     try
     {
         var frmAddStage = new FrmAddStage();
         UIAssistant.OpenModalForm(frmAddStage, false, true);
         if (frmAddStage.DialogResult == DialogResult.OK) {
             stages.AddRange(frmAddStage.BsonDocumentList);
             FillStagesTreeview();
         }
     }
     catch (Exception ex)
     {
         Utility.ExceptionDeal(ex);
     }
 }