The name(s) of css class(es) that are going to be applied to the header cell of that column.
Examples
sample
<table id="grid"></table>
<style>
.italic { font-style: italic }
</style>
<script>
$('#grid').grid({
dataSource: '/Players/Get',
columns: [
{ field: 'ID', width: 56 },
{ field: 'Name', headerCssClass: 'italic' },
{ field: 'PlaceOfBirth' }
]
});
</script>