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The following thread explains how to do this : http://xceed.com/CS/forums/thread/12723.aspx
The problem in your case is the way you set the data binding to the grids. You need to set the DataSource to the table, and not only to the DataSet, because the DetailGrid will not be able to find the table it needs to bind to for the relation to work.
grid.SetDataBindings( ds.Tables(0), “” )
det.SetDataBindings( ds.Tables(0), ds.Relation(0).RelationName )
Imported from legacy forums. Posted by André (had 1590 views)