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".

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