Override the property in a custom form descendant to indicate whether any custom field is modified.
public virtual bool IsAppointmentChanged( Appointment appointment )
Overridable Public Function IsAppointmentChanged( ByVal appointment As Appointment ) As Boolean
The following code illustrates how you can use the IsAppointmentChanged property in a custom form to indicate that a custom field is modified so that the AppointmentFormController object on the form will save the appointment.