<Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid">
  <Grid.Resources>
    <xcdg:DataGridCollectionViewSource x:Key="cvs_orders"
                                       Source="{Binding Source={x:Static Application.Current},
                                       Path=Orders}"
                                       AutoCreateItemProperties="False">
      <xcdg:DataGridCollectionViewSource.ItemProperties>
        <xcdg:DataGridItemProperty Name="ShipCountry"/>
        <xcdg:DataGridItemProperty Name="ShipCity"/>
        </xcdg:DataGridCollectionViewSource.ItemProperties>
      </xcdg:DataGridCollectionViewSource>
     <Style TargetType="{x:Type xcdg:GroupHeaderControl}">
       <Setter Property="MinWidth"
               Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ScrollContentPresenter}},
                               Path=ActualWidth}"/>
     </Style>
     <Style TargetType="{x:Type xcdg:ColumnManagerRow}">
       <Setter Property="MinWidth"
               Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ScrollContentPresenter}},
                               Path=ActualWidth}"/>
     </Style>
    </Grid.Resources>
    <xcdg:DataGridControl x:Name="OrdersGrid"
                         ItemsSource="{Binding Source={StaticResource cvs_orders}}"/>
</Grid>