Scroll arrows areas

Alex, I searched (in every lib .js file) how to detect events for scrolling arrows, but could not find it.
(ie firing a custom event onMouseOver any of the scroll arrows).
Could you please point me on the right direction?.
Thanks

Are you talking about arrows which are part of the scrollbar? If so - I don't think it is possible to get a separate event for the arrow. I am only aware about onscroll event.