Hi All, this is a well-coverd topic and super basic, but I am missing something. I have this custom data type using the userControlGrapper as base. I have done this before a million times over, but for some reason it's not saving the value from my control to the db/cache?

public partial class Dt_DocumentCategories : System.Web.UI.UserControl, IUsercontrolDataEditor
    {
        public string umbracoValue = "";
        protected void Page_Load(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(Server.MapPath("/App_Data/DocumentCategories.xml"));

            if (!Page.IsPostBack)
            {
                _documentCategories.Items.Add(new ListItem("Select...", ""));
                foreach (XmlNode nd in doc.DocumentElement.SelectNodes("//categories/add"))
                {
                    _documentCategories.Items.Add(new ListItem(nd.Attributes["name"].Value, nd.Attributes["name"].Value));
                }
            }

            if (!umbracoValue.Equals(""))
            {
                _documentCategories.Items.FindByValue(umbracoValue).Selected = true;
            } 
        }

        #region IUsercontrolDataEditor Members

        object IUsercontrolDataEditor.value
        {
            get
            {
                return umbracoValue;
            }
            set
            {
                if (value != null && !String.IsNullOrEmpty(value.ToString()))
                {
                    umbracoValue = value.ToString();
                }
            }
        }

        #endregion

I am running 4.5.1 on Win 7/SQL Server 2005. Is this related to 4.5.1, perhaps?

Thanks for helping - a seemingly - blind man! 

-- Nik