Spark's Core.cs. Where does sqlSelect get populated

Hi There,

I'm busy  messing around with Spark. Great job, by the way!

I've created my own project and reproduced the required classes and layout but when I call the Single method e.g:
var people= MyContext.People.Single(where: "FirstName = @0", parms: "Joe");

It calls the CreateSelect method in the Core class, in this method the sqlSelect variable does not contain the column names e.g.:
SELECT {0}  FROM [Person] {1} {2}

In the sample app this variable does contain the column names.
Where is this variable assigned to? I'm sure I missed something : )

Thank you!