MonthCalendar controls
Specifies the number of months the calendar scrolls when the user clicks a scroll button.
To set the ScrollRate property:
Select a number from the ScrollRate spin control on the General page in the Properties view.
The ScrollRate property takes an integer value. The default is 1, which means that the calendar scrolls by one month, however many months display. This example sets ScrollRate to 3:
mc_1.ScrollRate = 3