I recently looked for an IOS scrollbar for iPhone and iPad written in AS3 to implement with an AIR to IOS project and wasn't able to find one so I decided I would try to make it my self. I'll tell you this much - IOS scrolling is more complex than you might think at first glance.
It's not a perfect re-make, but it's comperable. The classes needed to compile the source are in the jacksonkr as3 kit on github. In case you're a minimizer, you'll only need com.jacksonkr.ui.IOSScroll* (2 files)
When using this on a mobile device you'll get the best performance when using a GPU mode and content that is either a bitmap or cached as a bitmap.
This IOS scrollbar for Actionscript was made using Flash CS5.5 and saved as a CS5 document. The source has been attached to this post.
I hear that it's confusing to download everything you need so I added a zip called everything.zip which works out of the box. If you're like me and just like to grab-files-and-go then just download the everything.zip