public void GetChildren(
     string promptName,
     string parameterName,
     string value,
     Action <ISearchablePromptItemCollection> result,
     Action <string> errorCallback)
 {
     _childPromptLevelService.GetChildren2Async(
         promptName
         , parameterName
         , new ParameterValue {
         Name = parameterName, Value = value
     }
         , r => OnGetChildrenForCompleted2(r, promptName, result),
         errorCallback);
 }