IE8 Javascript profiler not showing source code

When using IE8's javascript profiler in the Developer Tools, why does it not show the url or line number in the report? 开发者_C百科If I double click on a function it says "Source code is not available for this location".

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You have to go to the Script tab and click Start Debugging to get line numbers and file names in profiler results.

Instructions with pictures: http://msdn.microsoft.com/en-us/library/dd565625(v=vs.85).aspx