Group configurations in version 1.x

XAML
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<xcdg:DataGridControl x:Name="OrdersGrid"
               ItemsSource="{Binding Source={StaticResource cvs_orders}}">
 <xcdg:DataGridControl.View>
   <xcdg:TableView>    
     <xcdg:TableView.GroupLevelConfigurations>

        <!--The configuration that will be applied to all first-level groups-->
        <xcdg:GroupLevelConfiguration InitiallyExpanded="False">
          <xcdg:GroupLevelConfiguration.Footers>
            <xcdg:GroupHeaderFooterItemTemplate VisibleWhenCollapsed="True">
              <DataTemplate>
                <xcdg:InsertionRow/>
              </DataTemplate>
            </xcdg:GroupHeaderFooterItemTemplate>
          </xcdg:GroupLevelConfiguration.Footers>
        </xcdg:GroupLevelConfiguration>

        <!--The default configuration will be applied to all other group levels.-->
        <xcdg:GroupLevelConfiguration/>
     </xcdg:TableView.GroupLevelConfigurations>
   </xcdg:TableView>
 </xcdg:DataGridControl.View>
</xcdg:DataGridControl>

 Group configurations as of version 2.0

XAML
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<xcdg:DataGridControl.GroupConfigurationSelector>
  <xcdg:LevelGroupConfigurationSelector>
     <!--The configuration that will be applied to all first-level groups.
         There is no need to specify a default group configuration since the
         built-in one will be used.  -->
     <xcdg:LevelGroupConfigurationSelectorItem Level="0">
        <xcdg:LevelGroupConfigurationSelectorItem.GroupConfiguration>
           <xcdg:GroupConfiguration InitiallyExpanded="False"
                                    UseDefaultHeadersFooters="True">
              <xcdg:GroupConfiguration.Headers>
                 <xcdg:GroupHeaderFooterItemTemplate VisibleWhenCollapsed="True">
                    <DataTemplate>
                       <xcdg:InsertionRow Background="HotPink"/>
                    </DataTemplate>
                 </xcdg:GroupHeaderFooterItemTemplate>
              </xcdg:GroupConfiguration.Headers>
           </xcdg:GroupConfiguration>
        </xcdg:LevelGroupConfigurationSelectorItem.GroupConfiguration>
     </xcdg:LevelGroupConfigurationSelectorItem>
  </xcdg:LevelGroupConfigurationSelector>
</xcdg:DataGridControl.GroupConfigurationSelector>

Group configurations as of version 6.2

XAML
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<xcdg:DataGridControl.GroupConfigurationSelector>
  <xcdg:LevelGroupConfigurationSelector>
     <!--The configuration that will be applied to all first-level groups.
         There is no need to specify a default group configuration since the
         built-in one will be used.  -->
     <xcdg:LevelGroupConfigurationSelectorItem Level="0">
        <xcdg:LevelGroupConfigurationSelectorItem.GroupConfiguration>
           <xcdg:GroupConfiguration InitiallyExpanded="False"
                                    DefaultHeadersFootersType="GroupHeaderControl">
              <xcdg:GroupConfiguration.Headers>
                 <xcdg:GroupHeaderFooterItemTemplate VisibleWhenCollapsed="True">
                    <DataTemplate>
                       <xcdg:InsertionRow Background="HotPink"/>
                    </DataTemplate>
                 </xcdg:GroupHeaderFooterItemTemplate>
              </xcdg:GroupConfiguration.Headers>
           </xcdg:GroupConfiguration>
        </xcdg:LevelGroupConfigurationSelectorItem.GroupConfiguration>
     </xcdg:LevelGroupConfigurationSelectorItem>
  </xcdg:LevelGroupConfigurationSelector>
</xcdg:DataGridControl.GroupConfigurationSelector>