The project release page (http://www.codeplex.com/Release/ProjectReleases.aspx?ProjectName=AtlasControlToolkit&ReleaseId=11121) lists version 3.0.20229 whereas the samples site (http://asp.net/ajax/ajaxcontroltoolkit/samples/) lists the build as 3.5.20229. I'm assuming 3.5.20229 is the correct build number for .NET Framework 3.5. I suggest updating the release page.
Comments: This ticket was filed for a pre-15.1 version of AJAX Control Toolkit. If this is still an issue in v15.1 or later, please create a new inquiry.
Comments: This ticket was filed for a pre-15.1 version of AJAX Control Toolkit. If this is still an issue in v15.1 or later, please create a new inquiry.