On `$scope.eventSource` the property `className` doesn't work

[sahilsharmafrank]

The className main-event should be attached to each of the events, instead its showing an blank array. But when i send className from backend it works fine. Please help me in resolving this.

$scope.eventSource = {
    url: "/getAvailData/user/1",
    className: 'main-event',           // an option!
    currentTimezone: 'America/Chicago' // an option!
};