Thanks for writing back.
I am attaching a simple Windows Phone project where the RadDatePicker is styled in a way similar to your requirements. It should get you started in styling the control as needed.
Here's a basic description of what I did:
1. Extracted the control template of RadDateSelector to get the default styles for the Looping Lists inside it.
2. From the default styles of the LoopingLists I extracted the default style for the Looping Items.
3. Extracted the default style of RadDatePicker, adjusted it so that the background of the popup is Blue (for demo purposes).
4. Adjusted the default style of the RadDateSelector with the looping lists inside it by applying the Looping Item's style with new Visual States.
I must admit this approach is a bit difficult and we will think about simplifying the way the DatePicker can be completely restyled.
Let me know if you have additional questions.
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