Wpf TabControl, TabItem used space Background Color

https://stackoverflow.com/questions/19864054/wpf-changing-background-behind-tabs-for-tabcontrol-when-tabitems-are-centered

<TabControl>
    <TabControl.Resources>
        <Style TargetType="{x:Type Grid}">
            <Setter Property="Background" Value="Red"/>
        </Style>
        <Style TargetType="{x:Type TabPanel}">
            <Setter Property="HorizontalAlignment" Value="Center"/>
        </Style>
    </TabControl.Resources>
    <TabItem Header="Test 1"/>
    <TabItem Header="Test 2"/>
    <TabItem Header="Test 3"/>
    <TabItem Header="Test 4"/>
</TabControl>