So I was playing around with NavigationNodeCollection, which is basically like SPNavigationNodeCollection just to make sure it worked without a hitch…Here is a little sample snippet of what should work:
Unfortunately, you get a nice little javascript error that does not allow you to access the child nodes. I tried a foreach() loop that gets a NavigationNode for each parent then loops through the NavigationNode.Children that did not work either. I threw in two ExecuteQueryAsync statements thinking that would help, unfortunately adding a second statement provides no different results. This appears to be a bug in the Silverlight Client Object Model. I reported the error. Hopefully, we get a fix by RTM so that we can use the easier method to get items into Silverlight, otherwise it’s back to WCF and cross domain policies. We all love cross domain policies right?