/// <summary>
        /// 工作区添加流程
        /// </summary>
        /// <param name="workFlowEnum">流程类型</param>
        public void AddModelToWorkArea(WorkFlowEnum workFlowEnum)
        {
            BaseWorkFlow addWf = WorkFlowFactory.GetWorkFlow(workFlowEnum);

            WorkAreaItems.Add(addWf);
            SelectItem = addWf;
            RegistModelEvent(addWf);
        }
 /// <summary>
 /// 从工作区移除流程
 /// </summary>
 /// <param name="workFlow"></param>
 /// <param name="workArea"></param>
 public void RemoveModelFromWorkArea(BaseWorkFlow workFlow)
 {
     WorkAreaItems.Remove(workFlow);
 }