Use SC.Enumerable's sortProperty to sort objects so that this works o…

…n any SC.Enumerable not just native arrays.

frameworks/desktop/views/select_field.js

@@ -99,13 +99,7 @@ SC.SelectFieldView = SC.FieldView.extend(
   sortObjects: function(objects) {
     if(!this.get('disableSort')){
       var nameKey = this.get('sortKey') || this.get('nameKey') ;
-      objects = objects.sort(function(a,b) {
-        if (nameKey) {
-          a = a.get ? a.get(nameKey) : a[nameKey] ;
-          b = b.get ? b.get(nameKey) : b[nameKey] ;
-        }
-        return (a<b) ? -1 : ((a>b) ? 1 : 0) ;
-      }) ;
+      objects = objects.sortProperty(nameKey);
     }
     return objects ;
   },