Hide system tables in SQL Server Web Data Administrator

Does anyone know how to hide the system databases (msdb, tempdb, master, and model) when using the SQL Server Web Data Administrator

We have a login set up that only has access to the user database that we want them to have access to, but when the list of databases are displayed in the SQL Server Web Data Administrator, the system dbs are displayed as well. The login can't select or modify the tables at all, but we don't want them to be able to see them either.