Still Confused About How To Detect FlowDocument Change and Scroll

Question

I read through the following article: http://stackoverflow.com/questions/1655208/detect-flowdocument-change-and-scroll

I have a FlowDocumentReader, not a FlowDocumentScrollViewer, with its ViewingMode set to Scroll. I still cannot figure out how to automatically scroll my FlowDocumentReader to the bottom when content is added to my FlowDocument. Perhaps I'm just not putting the code from the above article in the right place.

Can anyone out there help? Thanks!