public override IEnumerator<EventBean> GetEnumerator()
{
// The merge data view has multiple parent views which are AddPropertyValueView
ArrayDeque<IEnumerable<EventBean>> iterables = new ArrayDeque<IEnumerable<EventBean>>();
foreach (var dataView in parentViews) {
iterables.Add(dataView);
}
return iterables.SelectMany(parentEnum => parentEnum).GetEnumerator();
}