Restricting the User to View other databases in the object explorer when he logs in

Hello,

I would like want someone to throw some light on my issue. My current Production server is a Shared server which is hosting 300 DBs. I have many users associated to various databases. My requirement here is I want the users to view only the list of the databases that they own / mapped in the object explorer when they are logged in to the SQL Server Management Studio instead of viewing the entire databases, though they don't have access. By default they are able to see the entire list of databases in the object explorer which is against my requirement.

Is there any possible way to achieve this. Any help would be greatly appreciated !! 

Thanks 

Momen

Thank you... MOMEN