I'm not sure how would one go about using scrollbars to select value. They are usually used to scroll some contents. For selecting values, you can use spin buttons or sliders.
after several hours of carefully hacking out a v 1.2 example of "range controls" i got TWO horizontal sliders. of course, as-is, both do the same things. i need to write new callbacks to the user can select which of the 0 -99 range he wants.
[[ FWIW, during my hacking, i updated the function to at least v 2.0. ]]