I need a grid to display info from two related tables. i.e.

a.custnum,b.custname,a.invoice,a.cknum

In the Data enviroment, I have set up A and B with a relationship from a.custnum to b.custnum

In the Control Source for each grid text object, I have selected the appro. field in the control source.....BUT....when I run the form, I get the first four fields from table A, but nothing from table B. I know their has to be an easy way.....Can anyone help?? Thanks in advance....Tim Ard