Adding Field to RecordSet...how?

[honers]

Is there any way to add fields to a RecordSet once it is created?

Let's say I initiate a recordset like this:

var productList =new RecordSet(["ProductName","Price","Color"]);

And then I want to add the field/column "Size" later on. How would I do this? Or does everything need to be added at the creation of the RecordSet?

Thanks, Kevin