jQuery Grid Plugin - jqGrid

I've been using jqGrid for about a year but today I am trying grouping for the first time and grouping does not work in my grid.  Here are my code excerpts:

...

        hidegrid: false,
        groupCollapse: true,
        grouping:true,
        groupingView : { groupField : ['News'], groupColumnShow : [true] },
        onCellSelect: function (rowid, iCol, cellcontent, e) {

...

from colmodel:

        }, {
            name: 'News',
            index: 'News',
            width: 10
        }]

before I call addRows, I put the data in the field:

                News:Math.round(json[i]['tscore'])

What mistake am I making?  I am using 4.2.0.