'Declaration Public ReadOnly Property WeekNumbers As ReadOnlyObservableCollection(Of Integer)
public ReadOnlyObservableCollection<int> WeekNumbers {get;}
When the CurrentCalendarMode is Days, this will contain a set of integers representing the week numbers for the days within the month. For all other navigation modes, the collection will be empty. The FirstItemRowOffset is applicable to the week numbers as well since week numbers are only generated based on the items within the Items collection.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2