Time range context menu in DayPilot.Month

Hi.
I'm using DayPilot Pro, version 921
I try to create context menu on time range selection by this code

var dp = new DayPilot.Month($el.attr('id'));
dp.contextMenuSelection = new DayPilot.Menu([
{
text: "add",
onclick: function () {
// do something...
}
}
]);

Unfortunately, context menu does not work.
Could you tell me is this context menu aviable in 921 version?