public override void OnAfterInsert(object treeNodeObj, int parentNodeId, object tree)
        {
            // INSERT YOUR CUSTOM AFTER-INSERT CODE
            //ensure parent month 
            // type the document as TreeNode
            TreeNode newsDoc = (TreeNode)treeNodeObj;

            // handle the event only for news items
            if (newsDoc.NodeClassName.ToLower() == "cms.news")
            {
                // get content of the inserted news item and send it by e-mail
                EmailMessage email = new EmailMessage();
                email.From = "maggie.nu@gmail.com";
                email.Recipients = "admin@gmail.com";
                email.Subject = "test";
                email.Body = "test";
                EmailSender.SendEmail(email);
            }
        }