Trap ListView Scroll Event

[Guest]

I have seen a lot of discussion abou this but not about auto-scroll of a
listview.
By that I mean, if you hold down left mouse button and move your mouse out
of listview border, your listview will auto-scroll if the listview has
visible hscrollbar or vscrollbar.
So far, no one knows how to trap this event and it seems it is controlled by
a callback function (but not sure). I want to either prevent this from
happening or trigger a after_autoscroll event. I tried spy and couldn't get
any message like wm_scroll and I doubt it generates any scroll message.
Does anyone has any idea?
Thanks