Hello Stefan Lorenz,
I am afraid that currently the RadGridView for Windows Forms cannot represent such hierarchy relations. However, our WinForms team is working on this and they will provide such possibilities in one of the following releases.
In the meantime the only workaround that came to my mind is to use two grids and bind the second one depending on the selected item in the master grid. The binding would look like this:
.radGridView1.DataSource = scope.Extent<Group>().ToList();
sender, EventArgs e)
.radGridView2.DataSource = ((Group)
On the other hand the OpenAccess model seems fine and I do not think that you should change it in any way. Hope that helps.
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