enable use of radiobuttonlist pre editor

src/Umbraco.Web/Models/ContentEditing/PreValueFieldDisplay.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Runtime.Serialization;
+using Umbraco.Core.Models;
 
 namespace Umbraco.Web.Models.ContentEditing
 {
@@ -40,5 +41,10 @@ namespace Umbraco.Web.Models.ContentEditing
         [DataMember(Name = "config")]
         public IDictionary<string, object> Config { get; set; }
 
+        /// <summary>
+        /// This allows for inner prevalues to be defined, for views such as radiobuttonlist, that require a selection.
+        /// </summary>        
+        [DataMember(Name = "prevalues")]
+        public PreValueInnerListItem[] PreValues { get; set; }
     }
-}
+}