The second selection is the focus of the items. It is used for mulltiple selection in RadCalendar. You can check its usage on this example: http://demos.telerik.com/silverlight/#Calendar/FirstLook
. Press CTRL and navigate with the arrows you can see the focus(not the selection) moving, then pressing Space ads the day to the selection. So this is actually the focus of the buttons.
However I agree with you that it is not needed in RadDatePicker as we don't have multiple selection. The problem in my view is that this selection in RadDatePicker is always on the first item, it should be on the selected item as in the RadCalendar.
We will consider changing this behavior in future. You can follow the PITS Issue by its ID: 3961 We have added points to your account for the suggestions. Don't hesitate to contact us if you have other questions.
All the best,
the Telerik team
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