title: Error when trying to execute JavaScript after page navigation on WebBrowser control
body: <p>I use a WebBrowser control in a WP7 app and have set <code>IsScriptEnabled</code> to true. Then when trying to invoke a script via <code>InvokeScript</code> of the WebBrowser I see a strange behavior:
  The script gets executed correctly on the first page. Then I navigate to another page via <code>Navigate()</code> and try to execute a script I get following error message:</p>
  
  <p>"An unknown error has occurred. Error: 80020006".</p>
  
  <p>I have tried to set <code>IsScriptEnabled</code> to true before navigating to the next page - no luck. Waiting for the completing of the document loading state doesn't help either.</p>
  
  <p>All HTML files are stored in isolated storage and get displayed correctly. Only the script interaction doesn't work.</p>
  
  <p>Any ideas?</p>