Multiline TabItem Header in WPF

Hi Experts,

          I have a Style defined for my TabItems for a Tab Control under WPF.  How do I need to change my below code to accomplish having multiline TabItem Header's like in the picture:


Here's my code.  I have everything I want except the multiline header text:

<Style TargetType="{x:Type TabItem}">
            <Setter Property="Foreground" Value="White"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TabItem}">
                        <Grid Width="200" Height="70">
                            <Border Name="Border" Background="Black" BorderBrush="White" BorderThickness="1,1,1,1" CornerRadius="6,6,0,0" >
                                <TextBlock TextWrapping="Wrap"  Height="70" Width="200" VerticalAlignment="Center" TextAlignment="Center" HorizontalAlignment="Stretch" >
                                    <ContentPresenter x:Name="ContentSite" ContentSource="Header" Margin="2,0,0,0"/>
                                </TextBlock>                                
                            </Border>                            
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSelected" Value="True">
                                <Setter TargetName="Border" Property="Background" Value="#009900" />
                            </Trigger>
                            <Trigger Property="IsSelected" Value="False">
                                <Setter TargetName="Border" Property="Background" Value="Black" />
                            </Trigger>
                        </ControlTemplate.Triggers>

                    </ControlTemplate>
                </Setter.Value>
            </Setter>            
        </Style>

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Thanks!