Oracle data source with an MVC 2.0 project

Question

well i have some connection troubles using an Oracle data source with an MVC 2.0 project, at the moment when right click on the Models folder ---> add new item ---> Data ---> Ado.net ---> Generate from database ---> New connection ---> choose data source [here there is no Oracle datasource found]
Just Sql Server Data source is allowed.
for the information the Oracle data access provider 10.0 g is installed and classical connection to my Oracle database is working fine, but no way adding the Oracle data source from Models folder.
i am using ASP.NET MVC2 2008 SP1 C#
can you help me please to resolve this problem ??
thank you