Would be good if ajax pivotgrid filter window supported OLAP dimension hierarchies

The Filter window / popup, doesn't seem to respect an OLAP dimension hierarchy.  It just shows a flat list at top level (for example case of date hierarchy just shows year).

See attached for a date hierarchy example in three different cube browsers, each with the same OLAP SSAS backend. Browsers are a) ajax pivot grid, b) kendo pivot grid and c) excel

The Ajax version just shows flat list, whereas kendo pivot and excel show the hierarchy

Thanks

Chris