Its got invisible layer on top, you got to position it correctly and your sprintfont box needs to be stretch the legnth of text. Which isn't ideal, especially for me who might need it to be longer/shorter.
Here is what I have at the moment with complicated version - Lol.
It is being made for my purposes, so not exactly what you are after. Push blue button to populate with text and use up / down buttons on scrollbar to move through text.
I use maths to scroll 13 lines, it rebuilds lines based on location etc etc etc etc lol
Built for touch so no mouse scroll. But still want to include touching scroll bar itself.
Edit: The comments are way old and a little outdated. I built in on 10 entries for round numbers - it is now 13