TabControlDefaultTemplate.xaml

 <SolidColorBrush x:Key="TabControlNormalBorderBrush" Color="#8C8E94"/>
        <Style x:Key="TabControlStyle1" TargetType="{x:Type TabControl}">
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="Padding" Value="4,4,4,4"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="BorderBrush" Value="{StaticResource TabControlNormalBorderBrush}"/>
            <Setter Property="Background" Value="#F9F9F9"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TabControl}">
                        <Grid ClipToBounds="true" SnapsToDevicePixels="true" KeyboardNavigation.TabNavigation="Local">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition x:Name="ColumnDefinition0"/>
                                <ColumnDefinition x:Name="ColumnDefinition1" Width="0"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition x:Name="RowDefinition0" Height="Auto"/>
                                <RowDefinition x:Name="RowDefinition1" Height="*"/>
                            </Grid.RowDefinitions>
                            <TabPanel x:Name="HeaderPanel" Grid.Column="0" IsItemsHost="true" Margin="2,2,2,0" Grid.Row="0" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1"/>
                            <Border x:Name="ContentPanel" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="0" KeyboardNavigation.DirectionalNavigation="Contained" Grid.Row="1" KeyboardNavigation.TabIndex="2" KeyboardNavigation.TabNavigation="Local">
                                <ContentPresenter x:Name="PART_SelectedContentHost" ContentSource="SelectedContent" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            </Border>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="TabStripPlacement" Value="Bottom">
                                <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="1"/>
                                <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0"/>
                                <Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
                                <Setter Property="Height" TargetName="RowDefinition1" Value="Auto"/>
                                <Setter Property="Margin" TargetName="HeaderPanel" Value="2,0,2,2"/>
                            </Trigger>
                            <Trigger Property="TabStripPlacement" Value="Left">
                                <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="0"/>
                                <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0"/>
                                <Setter Property="Grid.Column" TargetName="HeaderPanel" Value="0"/>
                                <Setter Property="Grid.Column" TargetName="ContentPanel" Value="1"/>
                                <Setter Property="Width" TargetName="ColumnDefinition0" Value="Auto"/>
                                <Setter Property="Width" TargetName="ColumnDefinition1" Value="*"/>
                                <Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
                                <Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
                                <Setter Property="Margin" TargetName="HeaderPanel" Value="2,2,0,2"/>
                            </Trigger>
                            <Trigger Property="TabStripPlacement" Value="Right">
                                <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="0"/>
                                <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0"/>
                                <Setter Property="Grid.Column" TargetName="HeaderPanel" Value="1"/>
                                <Setter Property="Grid.Column" TargetName="ContentPanel" Value="0"/>
                                <Setter Property="Width" TargetName="ColumnDefinition0" Value="*"/>
                                <Setter Property="Width" TargetName="ColumnDefinition1" Value="Auto"/>
                                <Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
                                <Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
                                <Setter Property="Margin" TargetName="HeaderPanel" Value="0,2,2,2"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>