WebBrowser control and JavaScript errors

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What I would do is assign an object to webbrowser.ObjectForScripting and then inject a javascript function that assigns windown.onerror to a wrapper that calls the external script in the host app. Like: 

window.onerror = function(message, url, lineNumber) 
{ 
  window.external.errorHandler(message, url, lineNumber);
}

Refere to:
http://notions.okuda.ca/2009/06/11/calling-javascript-in-a-webbrowser-control-from-c/

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