Hi, At runtime I'm disabled and enabling weekenddays in the calendarInfo using: myCalendarInfo.DaysOfWeek(Infragistics.Win.UltraWinSchedule.DayOfWeekEnum.Saturday).Enabled = False When I do this however, the effect is not visible. After long and tedious debugging I discovered that the property was being set correctly, the control didn't repaint however. So when I forced a repaint, the weekday header does visibly change state (so the 'S' for sunday goes gray), but the sundays in that month don't disable (they remain active). Now when I SCROLL the control to another month and then scroll back, the styling for the disabled sundays HAS changed. How to fix this? How to make changes to the calendarInfo object immediately visible on the calendar control? Thanks a bunch!