The bubble property (DayPilot.Bubble) sets the bubble object used to display event details on hover.
new DayPilot.Bubble()
DayPilotdp.bubble = new DayPilot.Bubble({
onLoad: function(args) {
var ev = args.source;
args.async = true; // notify manually using .loaded()
// simulating slow server-side load
setTimeout(function() {
args.html = "testing bubble for: <br>" + ev.text();
args.loaded();
}, 500);
}
});