How To Add scrollbar in Spark list which will work on mouse movement ?

Hi,
I want to add scrollbar in Spark list which will work on mouse movement, i.e instead scrolling down it will sense mouse position and scroll automatically. I could not find a way to handle this with horizontalLayout.
I tried hovering on list and setting ensureIndexIsVisible(index) but hovering element index is not present in the Spark List.
Any idea on this will be highly appreciated.
Thanks in advance
Avishek

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How To Add scrollbar in Spark list which will work on mouse movement ?

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