Why no 'Back' button?

Hi,
In Visual Studio there is a 'Back' button that enables you to go back to a report which has just been drilled through from. Why does this button not appear in Report Manager or the ASP.Net Report Viewer control?

Thanks
Jamie

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http://sqlblog.com/blogs/jamie_thomson/ | http://jamiethomson.spaces.live.com/ | @jamiet