Question on hiding columns in a  Nested Hierachal Grid View.

I have two Tables in a DataSet, with a DataRelation between them.  The two tables are linked together by the two columns( keys ).

I would like to hide the display of the two columns in the nested Grid.

So in my FieldLayoutInitialized event, I loop through my fields in the fieldlayout, and set the Visibility = Visibility.Hidden.

This hides the columns from view, however it does not shift the remainin columns to the right.  It just leave a big open area where the two columns where before.  I even tried setting the CellWidth to 0, but I still have the space.

Am I doing something wrong ?  If so, what would be the best way to hid the two key column on the nested view ?

Thanks

DK