/// <summary>
        /// Checks for validation errors after invoice is saved
        /// </summary>
        public bool CheckForValidationError(Sales salesObject, string nameOfValidationError)
        {
            HtmlDiv validationErrorDiv = salesObject.SelectDivOnPage("notify01");
            var validationErrorCustomControl = validationErrorDiv.GetChildren();

            HtmlDiv currentValidationError = null;

            //loop throught the notification div to find if error exists
            foreach (var currentError in validationErrorCustomControl)
            {
                if (currentError.FriendlyName.Contains(nameOfValidationError))
                {
                    currentValidationError = (HtmlDiv)currentError;
                }
            }

            //check if div is present
            if (currentValidationError != null)
            {
                return true;
            }
            else
            {
                Assert.Fail("Validation box not thrown up");
            }

            return false;
        }