Some problems with the prefs example project:

In the Window1 pbRead action event a node is dimmed as "rootNode" but called as "root.AppendChild(.... "

I fixed the above problem and ran the project and added 2 prefs. I saved the prefs. When I read the prefs back in only the first key/value pair was listed. I then tried adding 3 prefs and still only the first key/value pair was listed upon reading the file.

Looking at the prefs text file I can see that all the data was saved. It just isn't being read in to the listbox.