DataDomainContext not authenticating

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Silverlight

RIA

OK so I have followed all the steps in the example at:

http://msdn.microsoft.com/en-us/library/ee707353(VS.91).aspx[^]

And login is working but my DataDomainContext is not authenticated when calling RIA Services. How does the DataDomainContext know to use the authenticated identity associated with WebContext when making the call?

The example (as always with these seems to be missing a needed bit of information). How does...

context.Load(context.GetProductsQuery().Take(numberOfRows));

...shown in step 8 know to use the authenticated Identity?

Thanks for any direction & help!