true, if the left border is displayed for an appointment; otherwise, false.
If an appointment lasts several days, visually it can be divided into several parts - one part for each day. For horizontal appointments, this display is possible in the Multi-Week (Month) view. If the appointment starts in one week and continues in another, the Month view splits that appointment by two rows. The appointment section in the second row has no left border (the HasLeftBorder property returns false).
The left border also is not drawn for appointments located in the all-day area of the Day, Work-Week or the Full Week views, if these appointments start before the first day that is visible in the view.