I need to select multiple events and resize them.  I found this Event Multi-Resize https://doc.daypilot.org/scheduler/event-multi-resizing/ 
but it doesn't work for me.  I've added this JS code to my index.cshtml's script section:
// Event Multi-Resize
    dp.eventClickHandling = "Select";
    dp.allowMultiResize = true;
    dp.onEventResized = function (args) {
        dp.message("Events " + args.multiresize.map(function (item) { return item.event.id(); }).join(', ') + " moved.");
    };
Is there something else I need to do to make this work?
Don