Best way to bind directly to objects returned from a web service

In silverlight 3 I had an object that had a property that was an observable collection. I returned this via a web service then databinded to it.

Upgrade to silveright 4.....

Now my program crashes because the Observable Collection is converted to an array.

What is the best way to do this? Observable collection is not even an op开发者_运维知识库tion any longer.

In the 'Service Reference' configuration under 'Advanced' is the 'Dictionary collection type' set to 'Array'?