Master detail datagrids sorting question

Hi I have 2 dataset's tables Master and Detail linked by dataset foreign key. I have 2 datagrid bounded to Master and foreign key MasterDetail. All this work well BUT i need MasterDetail datagrid to be sorted on some column (saying PosInList)_without_ _user_ _intervention_ (clicking header). How can i implement this ? DefaultView - useless, datagrid ignore defaultView (i don't know why). TIA Alex

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