Question
Is there a way to change the style of selected items?
Answer
The built in selection highlight is limited to the TimeItemLayout.SelectHandles=color, but if you want something more fancy it is really easy to implement the OnTimeItem_SelectionChanged event and simply change the TimeItemLayout if the time item is selected or de-selected.
The event is called both for selection and de-selection, so that you can set the timeitemlayout back to the original. Just check the e.TimeItem.Selected, true=selected false=de-selected.