jqgrid - 如何使 jqgrid 组标题在悬停时突出显示

Question

使用 jQuery 和 themerolled jquery-ui，我有一个 jqgrid，在几个组标题下有列。每个列标题在按预期悬停时显示突出显示颜色，但组标题在悬停时从不突出显示。悬停时jqgrid组标题可以突出显示吗？这是有问题的代码。

$(gridnm).jqGrid('setGroupHeaders', {
    useColSpanStyle: true, 
    groupHeaders:[
        {startColumnName: 'fld00', numberOfColumns: 4, classname: 'colheader', titleText: '<b>Incoming Totals</b>'},
        {startColumnName: 'fld04', numberOfColumns: 3, classname: 'colheader', titleText: '<b>Unanswered Totals</b>'},
        {startColumnName: 'fld07', numberOfColumns: 3, classname: 'colheader', titleText: '<b>Outgoing Totals</b>'},
        {startColumnName: 'fld10', numberOfColumns: 3, classname: 'colheader', titleText: '<b>All Totals</b>'}
    ]
});