Change date cell background item in WinRT XamlToolkit Calendar Control Windows phone 8.1

Dec 14, 2014 at 4:22 PM
In this topic, @SergeyBarskiy could change the background color of certain date cells by using BackgroundConverter (implement interface IDateToBrushConverter). I used WinRT XamlToolkit Calendar Control to create a calendar in my XAML Windows Phone 8.1 project. Then, I spent one day on trying to change some date cells background as @SergeyBarskiy did with his toolkit. However, I could not do it. Additionally, I realized that I could not change the style of CalendarButtonStyle, CalendarItemStyle, and CalendarDayButtonStyle.

How can I change background of some date cells ?