easyUI treegrid 加了一列radio button 怎么获取radio的值？

获取到的orgtype是undefined
代码如下：

 <th data-options="field:'orgtype',width:80,formatter:formatP">类型</th>
        function formatP(value){
                var s = '<input type="radio" value="1">分行'+
                '<input type="radio" value="2">支行'+
                '<input type="radio" value="3">网点';
            return s;
        }

        t.treegrid('endEdit', editingId);
        var row = t.treegrid('getSelected');
        var url = "/ABC/orgUnitPriceMain?flagS=" + flagS;
                if (row) {
                    $.post(url, {
                        id : row.id,
                        code : row.code,
                        orgname : row.orgname,
                        price : row.price,
                        parentName : row.parentName,
                        orgtype : row.orgtype               
                        }
                    })
                }