Hi, I found the answer in this Stack Overflow post:
http://stackoverflow.com/questions/6210895/listview-inside-scrollview-is-not-scrolling-on-android
The accepted answer is: "Starting from API Level 21 (Lollipop) nested scroll containers are officially supported by Android SDK."
So, the RadListView is working great. It's just an underlying Android thing. From API 21 and above nested scrolling is supported.
Thanks,
Ron