public class AppointmentLabelItem :
Labels specify colors that the scheduler uses to paint its appointments.
A scheduler view holds its labels in the LabelItems collection of the SchedulerDataStorage object assigned to the view's DataStorage property. You can customize existing labels, remove them or add new ones. An individual label is an AppointmentLabelItem object. It provides the Caption and Color properties that you can use to specify a label's display name and color.