Thank you for your response.

I looked at the examples, and they do neat things, but not what I wanted.

ScrollWindow is basically a Box that has a scrollbar, and then when you move the scrollbar or roll your mouse wheel, it moves the viewport of the box up and down, just like the scrollbar in a typical browser window.

The example code shows how to do things with scrollbars other than using them as scrollbars. Perhaps I was looking at the wrong examples?