Thank you for using RadDatePicker for Windows Phone 8.
By default RadDatePicker uses phone's resources. If you don't want to change the style and/or template of the control, another option that you have is to override the brushes that it uses: PhoneForegroundBrush
in a way similar to this:
SolidColorBrush foregroundBrush =
foregroundBrush.Color = Colors.Red;
If you change these brushes you will easily see where each of them is used.
I hope this information helps.
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