wpf datagrid alternate row coloring

I have tried this method.. without luck..

 <Style TargetType="{x:Type DataGridRow}">
  <Style.Triggers>
      <Trigger Property="ItemsControl.AlternationIndex" Value="0">
          <Setter Property="Foreground" Value="Red" />
     </Trigger>
  </Style.Triggers>
</Style>

Is there a way to get the row Index? I have even tried

<DataTrigger Binding="{Binding AlternationIndex}" Value="0">
    <Setter Property="Foreground" Value="Green"></Setter>
</DataTrigger>

Finally, this is what I ended up with for generically setting alternate row colors.

<Style TargetType="{x:Type DataGrid}">
    <Setter Property="Background" Value="#FFF" />
    <Setter Property="AlternationCount" Value="2" />
</Style>

 <Style TargetType="{x:Type DataGridRow}">
    <Style.Triggers>
        <Trigger Property="ItemsControl.AlternationIndex" Value="0">
            <Setter Property="Background" Value="#CCC"></Setter>
        </Trigger>
        <Trigger Property="ItemsControl.AlternationIndex" Value="1">
            <Setter Property="Background" Value="#EEE"></Setter>
        </Trigger>
    </Style.Triggers>
</Style>

Unless already done, you have to set the AlternationCount property of DataGrid:

<DataGrid AlternationCount="2"
          ... />

You should additionally check whether the Foreground property is used for any Control in the DataGridRow. Try setting the Background property to test the alternation stuff.

Try setting the alternating background like this:

  AlternationCount="2" AlternatingRowBackground="Bisque"

Try this

  <DataGrid AlternationCount="2"
            AlternatingRowBackground="Salmon" ........

Finally I used combination of Robin Maben and Th3G33k solution, because I want the alternation colour to override with my own, when some condition is met. Thanks both.

<DataGrid x:Name="gridCustomerOrderItems" HorizontalAlignment="Stretch" 
                  VerticalAlignment="Stretch" AutoGenerateColumns="False"
                  AlternationCount="2"
                  IsReadOnly="True" CanUserReorderColumns="True"
                      ScrollViewer.CanContentScroll="True"
                      ScrollViewer.VerticalScrollBarVisibility="Auto"
                      ScrollViewer.HorizontalScrollBarVisibility="Auto">

                <DataGrid.RowStyle>
                    <Style TargetType="DataGridRow">
                        <Style.Triggers>
                            <!--first alteraniting colour-->
                            <Trigger Property="ItemsControl.AlternationIndex" Value="1">
                                <Setter Property="Background" Value="#EEE"></Setter>
                            </Trigger>
                            <!--then override with my own colour-->
                            <DataTrigger Binding="{Binding InvoiceSet}" Value="True">
                                <Setter Property="Background" Value="Green"></Setter>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </DataGrid.RowStyle>