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http://social.msdn.microsoft.com/Forums/en-US/sharepoint2010general/thread/91004586-8982-4ca8-84de-f868a26d0cc5/

Hide Yellow Status Bar Sharepoint 2010

Open V4.Master file in Sharepoint desginer 2010 and search for

 

تگی که در اون STATUS BAR هست رو پیدا کنید و COMMENT اش کنید.