You can customize the display and states of the RadClockItem by editing the ClockStyle of RadDateTimePicker. In Expression Blend, generate the ClockStyle of the control. This style contains an ItemContainerStyle that targets the RadClockItem. It contains a MouseOverVisual and a SelectedVisual which are responsible for the states of the clock item. You can customize these elements to fit your design.
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All the best,
the Telerik team
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