Based on the post at http://www.nibble.be/?p=97 I've created a usercontrol following the [DataEditorSetting()] syntax to define config items for the data type, but I'm unable to save changes to these.

public partial class TestClass : System.Web.UI.UserControl, IUScontrolDataEditor {

   private string umbracoValue;
   public object value { 
       get {
           return umbracoValue; 
       } 
       set { 
           umbracoValue = value.ToString(); 
       } 
    }

    [DataEditorSetting("account ID:", defaultValue = "testID1234")]
    public string accountId { get; set; }

    protected void Page_Load(object sender, EventArgs e) {
        // since Page_Load isn't called when viewing the data type definition, there's nothing to see here - all I'm doing is serializing a string value that I then use in an ajax request
    }
}

If I manually updated the values in the DB, the data type reflects the changes, but trying to do so from the back office doesn't work, which makes me think I'm missing something - do I need to define the accessors for each editor setting?