WinRt WebView control handling navigation within the control
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I have a Metro app using a WebView control.  I'm using `NavigateToString` to load a html file which may contain hyperlinks.  What I then want to do is detect when one of these hyperlinks is selected and, instead of allowing navigation within the WebView control, to launch IE and view the page there instead.

Is this possible within the WinRT constraints, and if so, how?

So far, I've tried capturing the `WebView_LoadCompleted()` event, but although it does fire at the right time, I can't see any details about the URI from the `NavigationEventArgs`.