What's the best practice for doing this. Simply a dropdown that has custom items. I've tried this but can't get it to work. Get a javascript 'focus' error and data is not saved. public class BTAreaIdControl : PropertySelectControlBase { public override void CreateEditControls() { base.CreateEditControls(); EditControl.Items.Add(new ListItem(CurrentPage.PageName, "1")); EditControl.Items.Add(new ListItem("Annan sida", "2")); } public BTAreaId BTAreaId { get { return PropertyData as BTAreaId; } } } The BTAreaId class is as generated from VS.