Steps back one visible time frame.
Call the NavigateBackward method to move one "scheduler screen" time frame backward. Depending on the selected view, the visual time frame is defined by different properties:
- Day View - DayView.DayCount;
- Work Week View - SchedulerControl.WorkDays;
- Week View - 7 days;
- Month View - MonthView.WeekCount;
- Timeline View - TimelineView.IntervalCount.