Nested Grid Demo

[Salman2044]

Hi , Can you please add multi-level subgrid example in ParamQuery Pro Demo.
I saw this example
http://paramquery.com/pro/demos/nesting
but this shows only two level hierarchy (Maingrid - Subgrid)
but i am looking for three level hierarchy example (Maingrid - SubGrid - Subgrid) like in the image.
(Attachment Showing Jqgrid example)