The following example demonstrates how to use a ComboBox as an auto-filter control to automatically filter the content of the ShipCountry column. ComboBox controls do not support multiple selections; therefore, the values of the target column will only be filtered by 1 value. Since, by default, the auto-filter control in the column-manager-cell drop downs support multiple selections, it is recommended to deactivate the drop down by setting the AllowAutoFilter property of the ColumnManagerRow to false to hide the column-manager cells' auto-filter controls and prevent unexpected synchronization behavior between the controls that have the same auto-filter target column or different selection modes.

XAML

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<Grid>    <Grid.Resources>      <xcdg:DataGridCollectionViewSource x:Key="cvs_orders"                                         Source="{Binding Source={x:Static Application.Current},                                                          Path=Orders}"                                         AutoFilterMode="And"                                         DefaultCalculateDistinctValues="False">        <xcdg:DataGridCollectionViewSource.ItemProperties>          <xcdg:DataGridItemProperty Name="ShipCountry"                                     Title="Country"                                     CalculateDistinctValues="True"/>          <xcdg:DataGridItemProperty Name="ShipCity"                                     Title="City"/>          <xcdg:DataGridItemProperty Name="ShipAddress"                                     Title="Address" />          <xcdg:DataGridItemProperty Name="ShipPostalCode"                                     Title="Postal Code"/>          <xcdg:DataGridItemProperty Name="ShipName"                                     Title="Name"/>          <xcdg:DataGridItemProperty Name="OrderDate"                                     Title="Order Date"/>          <xcdg:DataGridItemProperty Name="Freight"/>        </xcdg:DataGridCollectionViewSource.ItemProperties>      </xcdg:DataGridCollectionViewSource>    </Grid.Resources>      <DockPanel>      <StackPanel Orientation="Horizontal"                  DockPanel.Dock="Top">        <xcdg:AutoFilterControl x:Name="ShipCountryAutoFilterControl"                                AutoFilterColumn="{Binding ElementName=OrdersGrid, Path=Columns[ShipCountry]}"                                AutoFilterContext="{Binding ElementName=OrdersGrid, Path=DataGridContext}">          <xcdg:AutoFilterControl.Template>            <ControlTemplate TargetType="{x:Type xcdg:AutoFilterControl}">              <ComboBox x:Name="PART_DistinctValuesHost"                        Width="125" />            </ControlTemplate>          </xcdg:AutoFilterControl.Template>        </xcdg:AutoFilterControl>          <Button Content="Clear Filter"                Command="xcdg:AutoFilterControl.ClearAutoFilterValues"                CommandTarget="{Binding ElementName=ShipCountryAutoFilterControl}"/>             </StackPanel>        <xcdg:DataGridControl x:Name="OrdersGrid"                            ItemsSource="{Binding Source={StaticResource cvs_orders}}">        <xcdg:DataGridControl.View>          <xcdg:TableView UseDefaultHeadersFooters="False">            <xcdg:TableView.FixedHeaders>                <DataTemplate>                  <xcdg:GroupByControl />                </DataTemplate>                <DataTemplate>                  <xcdg:ColumnManagerRow AllowAutoFilter="False" />                </DataTemplate>              </xcdg:TableView.FixedHeaders>            </xcdg:TableView>          </xcdg:DataGridControl.View>        </xcdg:DataGridControl>      </DockPanel>    </Grid>