jQuery Grid Plugin - jqGrid

All examples of subgrid show use of anohter call to obtain subgrid data.

What id like to accomplish is for the subgrid to display records nested within the current record. Example (ill use json) of Orders containing LineItems where 'main grid' contains the OrderId, & Date and subgrid contains LineItems detail of its Order:

"rows":

{"OrderId":1,"Date":"01-01-2010″,"LineItems":[

   {"ItemId":123,"ItemName":"Stuff1","QTY":3},

   {"ItemId":456,"ItemName":"Stuff2","QTY":2},

   {"ItemId":789,"ItemName":"Stuff3","QTY":1}]},

{"OrderId":2,"Date":"01-10-2010″,"LineItems":[

   {"ItemId":789,"ItemName":"Stuff3","QTY":2},

   {"ItemId":123,"ItemName":"Stuff1","QTY":1},

   {"ItemId":456,"ItemName":"Stuff2","QTY":3}]}