<Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"
 xmlns:local="clr-namespace:Xceed.Wpf.Documentation">
  <Grid.Resources>
   <xcdg:DataGridCollectionViewSource x:Key="cvs_orders"
                                      Source="{Binding Source={x:Static Application.Current},
                                                Path=Orders}"/>
   <Style TargetType="{x:Type xcdg:HierarchicalGroupByControl}">
      <Setter Property="NoGroupContent"
              Value="Hello World" />
   </Style>
  </Grid.Resources>
  <xcdg:DataGridControl x:Name="OrdersGrid"
                      ItemsSource="{Binding Source={StaticResource cvs_orders}}"/>
 
</Grid>