FIX. RadCalendar - Incorrect week numbering

Use the following code snippet:

radCalendar1.AllowMultipleView = true;
radCalendar1.MultiViewColumns = 1;
radCalendar1.MultiViewRows = 5;
radCalendar1.ShowRowHeaders = true;

CultureInfo ci = new CultureInfo("en-US");
CalendarWeekRule weekRule = CalendarWeekRule.FirstDay;
ci.DateTimeFormat.CalendarWeekRule = weekRule;
radCalendar1.Culture = ci;

Expected behavior: when the CalendarWeekRule is FirstDay, 01/01/2013 should be displayed as week 1