ShowWeeks in TPlannerMonthView

Showed number of weeks are bad. This year started first week at 4.1.2010, but TPlannerMonthView  shows 2 week

 
I need repair it.
 
Thanks
Jan Fiala

What week calculation system are you in ? If you're in ISO week calculation, set PlannerMonthView.YearStartAt.ISOWeekNumber = true