You need add all servers to RegSrvr.xml file which is stored in C:\Users\\AppData\Roaming\Microsoft\Microsoft SQL Server\100\Tools\Shell for SQL 2008 on Windows 2008 and for SQL 2005 it should be in C:\Documents and Settings\\Application Data\Microsoft\Microsoft SQL Server\90\Tools\Shell.
Nag
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How to get the best help on a forum
http://www.sqlservercentral.com/articles/Best+Practices/61537