One month frame size

[frios]

Is there a way that I can calculate the frame size of a specific month? I want to be able to only display a month up to the bottom edge of the month and still allow to scroll the calendar to the next/previous month. This would require that the frame size be calculated after each scroll has stopped to take into account months that display 5 vs 6 weeks. Also, is there some sort of notification when the calendar has finished scrolling?