Please refer to the code below:
$('#dg').datagrid({
columns: [
[
{field:'productid',title:'Product',width:100,rowspan:2},
{title:'Details',colspan:4}
],
[
{field:'listprice',title:'List Price',width:100},
{field:'unitcost',title:'Unit Cost',width:100},
{field:'attr1',title:'Attribute',width:200},
{field:'status',title:'Status',width:100}
]
]
})