Straight to your question.
To skip the focus on the DatePicker, you have to set the IsTabStop
property to false
to the PickerTextBox (PickerTextBox is part of the DatePicker).To get the PickerTextBox template you can create one DatePicker in Blend, and then right-click on it and Edit Template. After that Blend will generate all templates for you and after finding the one of the PickerTextBox you can set the property there. You can see the attached project for more details.
If you have any need of further assistance please feel free to ask again.
the Telerik team