1) First you need to create an sprite, lets call it camera. 2) add ScrollTo behavior to Camera object. 3)Create a Global number named UpDown. 4)create events as...
I also found it necessary to create a specific sprite called ScrollSizer -- which was a like a group for my many scrolling sprites.
If that is off screen, disable bottom scroll.
This example ONLY worked with one single scroll object, not many, as it would put ALL of them on the bottom. I suppose I could detect some offsets, or something -- there are many ways to handle this.