// [ActionArgument(displayName = "Variable to store document")]
        // public String ExcelDocumentVar = "WordDoc";

        protected override void DoAction()
        {
            WorkBook = ExcelApp.Workbooks.Add();
            if (Visible)
            {
                ExcelApp.Visible = Visible;
                WorkBook.Activate();
            }
        }
        // [ActionArgument(displayName = "Variable to store document")]
        // public String ExcelDocumentVar = "WordDoc";

        protected override void DoAction()
        {
            WorkBook = ExcelApp.Workbooks.Open(ParseStringForVariable(Filename));
            if (Visible)
            {
                ExcelApp.Visible = Visible;
                WorkBook.Activate();
            }
        }