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<DataGrid ItemsSource="{Binding Customers}" AutoGenerateColumns="False" >
<DataGrid.Columns>
<DataGridTextColumn x:Name="AAA" Header="First Name" Binding="{Binding FirstName}" />
</DataGrid.Columns>
<DataGrid.RowDetailsTemplate>
<DataTemplate>
<DataGrid ItemsSource="{Binding Customers}" AutoGenerateColumns="False" >
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding FirstName}" IsReadOnly="True" Width="{Binding ElementName=AAA, Path=ActualWidth}" />
</DataGrid.Columns>
</DataGrid>
</DataTemplate>
</DataGrid.RowDetailsTemplate>
</DataGrid>