internal static IEnumerable <IDataGridItemContainer> GetTemplatedDescendantDataGridItemContainers(this IDataGridItemContainer source) { if (source == null) { throw new ArgumentNullException("source"); } var predicate = IDataGridItemContainerExtensions.GetTemplatedDescendantExpandPredicate(source); return(IDataGridItemContainerExtensions.GetChildDataGridItemContainers(source, predicate)); }