Strongly Typed Dataset and Gridview: Problem

I am trying to populate a gridview using two tables. I also have a strongly typed dataset and used the method on this page:

http://www.asp.net/data-access/tutorials/creating-a-data-access-layer-vb

the problem is that, when i try to use two table the gridview does show up (I checked through debugging that the datatable comes back as empty).

I will be grateful for ur assistance or thoughts. Thank you