datagridview source from 2 tables

Question

Hy! I have 2 SQL Server 2005 tables with a one to one relation. I've made a data set with a data relation between these two tables, I've created a datagridview with datasource = one of the datatable. My question is how can I tell to datagridview that the last collumn to display should be a collumn from the other table. I'he tried with DataPropertyName but is not ok, datagridview still display from only one table.( do not want to use a join select from these two tables ) . Thank you.