If the json response of the server is like

{
“id”: “1406701″,
“type”: “773″,
“targetDate”: new Date(1244527200000),
“lastModifiedDate”: new Date(1158142174000),
“lastModifiedUser”: “SUPER”
}

where the date (in bold) is a native javascript object,
the grid render the cell empty.

Can I config the grid to support that?