Hi Matthew Cartwright,
We considered this issue as bug which is already resolved is available in our latest internal build as well as in our upcoming service pack - later this year.
The provided samples offer custom solution to the problem mentioned above. However, it can be used with the service pack as well and will no interfere with the default autoscroll functionality.
If you have any further questions do not hesitate to contact us.
the Telerik team
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to help you get started with RadControls for Silverlight