void BindList (SchemaManager mgr)
 {
     var om = mgr.GetObjectClassManager ();
     _list = om.Data.Values.ToList ();
     _list.Sort (SortObjectClassDTO);
     dataSourceList = new List<KeyValuePair<string,string>> ();
     foreach (var obj in _list) {
         dataSourceList.Add (new KeyValuePair<string,string> (obj.Name, obj.Description));
     }
 }