ASP.net Adding Database Table for XML Schema object

Question

I am using VS 2008 with SP1.If I drag DataSet object to solution Explorer,I am able to add Database tables to Designer interface.I am watching some video tutorial ,they are draging XML Schema object instead DataSet object and adding Database table to create Schema.

When i try to do that there is no designer to add the Database table if i use "XMLSchema" object.(XML Schema Explorer is installed as i am using VS 2008 SP1).

Do i need to add any additional add in or utility to achieve the same?