@figuerres there is a hotfix for that.

Scott Hanselman had written about this problem a while back. You can see it here:

http://www.hanselman.com/blog/BugAndFixASPNETFailsToDetectIE10CausingDoPostBackIsUndefinedJavaScriptErrorOrMaintainFF5ScrollbarPosition.aspx

The following hotfix is for .NET 4.0, not sure if it applies the patch to all versions 4 and lower.

http://support.microsoft.com/kb/2600088