Hi Francisco,

This is not a supported scenario for the igGridTooltips, however it's not hard to achieve. All you need to do is bind to the tooltipShown event and inside it alter the contents of the tooltip's container.

For example if you wish to have the text of the tooltip appear in bold:

$("#grid1").igGrid({
// grid options
                    features: [
                        {
                            name: "Tooltips",
                            tooltipShown: tooltipShown
                        }
                    ]
 });

function tooltipShown (evt, args) {

$("#" + $("#grid1").igGridTooltips("id") + "_container").html("<strong>" + args.tooltip + "</strong>");

}

I hope this helps!  Please, let me know if you need further assistance.

Best regards,

Stamen Stoychev