OnClientAppointmentContextMenu
The OnClientAppointmentContextMenu client-side event is called when the user right-clicks on an appointment. It fires before the built-in context menu is shown (if it is enabled).
Two parameters are passed to the event handler:
sender is the scheduler client object.
eventArgs has the following methods:
get_appointment() - returns the appointment instance.
get_domEvent() - the raw DOM event sent by the browser.