You can define the highlight row class and return it in some conditions. Please refer to the code below.
<style type="text/css">
.my-row:not(.datagrid-row-selected){
background-color:#6293BB;
color:#fff;
font-weight:bold;
}
</style>
<script type="text/javascript">
function rowStyler(index,row){
if (row.listprice < 30){
return {class:'my-row'};
}
}
</script>