public virtual Type GetType(IPublishedPropertyType propertyType, ElementsConfiguration config)
 {
     return(config.SinglePicker ? typeof(IPublishedElement) : typeof(IEnumerable <IPublishedElement>));
 }
 public virtual object Convert(IPublishedElement owner, IPublishedPropertyType propertyType, IEnumerable <IPublishedElement> elements, ElementsConfiguration config)
 {
     return(elements);
 }