This demo shows how to add additional fields to the default editor window. Here, an additional field
Event Type has been added to the default event editor and its value is processed accordingly.
In this demo, the additional field is added to the default event editor by using the
PopupOpen event which gets triggered before the event editor is opened on Schedule.
PopupOpen is a client-side event that triggers before any of the popups are opened on Schedule.
Here, the additional field (any of the form elements) must be provided with the common class
e-field to handle and process those additional data into the default event object.