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To clarify, you cannot bind a collection directly to the EntityDetailDescription, and you cannot bind an EntityDetailDescription to the ItemsSource of a DataGridControl.
The proper order would be:
1) create a DataGridCollectionView that has your data source (collection, DataTable, etc.) as it's Source.
2) you can manually specify master-detail relationships by adding EntityDetailDescriptions to the DataGridCollectionView.DetailDescriptions collection.
3) you can then set the DataGridCollectionView to be the ItemsSource of your DataGridControl.
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