I'll see if I can add a callback for the scrolling this weekend.
Changing the scrollbar value of the second list with setScrollbarValue will cause another callback, but I guess that won't do much harm because it will call setScrollbarValue on the first list again with the value that it already had so it won't generate another callback.
Changing the scrollbar value of the second list with setScrollbarValue will cause another callback, but I guess that won't do much harm because it will call setScrollbarValue on the first list again with the value that it already had so it won't generate another callback.