MG Studio 2009 have a number of new template I can choose. But I found the resource id is "Library://Lots/AJAX.ApplicationDefinition". It is not *.WebLayout for the extension of layout. So it prompts the error "An exception occurred in the XML parser. An exception occurred in the XML parser. Exception occurred in method MgWebLayout.ParseWebLayoutDefinition at line 276 in file d:\buildforgeprojects\mapguide_open_source_v2.0\build_23.8\mgdev\web\src\webapp\WebLayout.cpp"