We aware of such behavior when extracting the RadCalendar
Template trough VS Designer or Blend. To fix it you would need to add the folowing line to the ContentControl named Content
located in the Template of DayButtonStyle, DecadeButtonStyle, MonthButtonStyle and YearButtonStyle :
You can also find more information in this KB article about how to customize the ButtonChrome.
I've attached a sample demo project where the DayButton is customize using implicit styles
I hope this helps.
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