WPF TabControl theme issue

<Style TargetType="TabItem">
    <Setter Property="FontFamily" Value="{StaticResource ResourceFont}"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="TabItem">
                <Border Name="Border" BorderThickness="3,3,3,0" BorderBrush="Navy" Padding="5,1,5,2" CornerRadius="5,5,0,0" Margin="2,0" >
                    <ContentPresenter x:Name="ContentSite"
                        VerticalAlignment="Center"
                        HorizontalAlignment="Center"
                        ContentSource="Header"
                        RecognizesAccessKey="True" />
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="true">
                        <Setter Property="Foreground" Value="Cyan"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>