HandyControl/HandyControl/Themes/Styles/Base/TabControlBaseStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:controls="clr-namespace:HandyControl.Controls"
                    xmlns:system="clr-namespace:System;assembly=mscorlib">

    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="../../Basic/Sizes.xaml"/>
    </ResourceDictionary.MergedDictionaries>

    <Style x:Key="TabItemStyle" TargetType="TabItem">
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
        <Setter Property="Background" Value="{DynamicResource RegionBrush}"/>
        <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
        <Setter Property="Margin" Value="0"/>
        <Setter Property="Padding" Value="10,6"/>
        <Setter Property="Height" Value="30"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="TabItem">
                    <Grid x:Name="templateRoot" SnapsToDevicePixels="true">
                        <Border x:Name="mainBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="0" Background="{TemplateBinding Background}" Margin="0"/>
                        <ContentPresenter x:Name="contentPresenter" TextElement.Foreground="{DynamicResource PrimaryTextBrush}" ContentSource="Header" Focusable="False" HorizontalAlignment="Center" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsSelected, RelativeSource={RelativeSource Self}}" Value="false"/>
                                <Condition Binding="{Binding TabStripPlacement, RelativeSource={RelativeSource AncestorType=TabControl}}" Value="Top"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="BorderThickness" TargetName="mainBorder" Value="0,0,0,0"/>
                        </MultiDataTrigger>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsSelected, RelativeSource={RelativeSource Self}}" Value="true"/>
                                <Condition Binding="{Binding TabStripPlacement, RelativeSource={RelativeSource AncestorType=TabControl}}" Value="Top"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Panel.ZIndex" Value="1"/>
                            <Setter Property="TextElement.Foreground" Value="{DynamicResource PrimaryBrush}" TargetName="contentPresenter"/>
                            <Setter Property="BorderThickness" TargetName="mainBorder" Value="0,0,0,3"/>
                        </MultiDataTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="TabControlBaseStyle" TargetType="TabControl">
        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
        <Setter Property="Background" Value="{DynamicResource RegionBrush}"/>
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="Foreground" Value="White"/>
        <Setter Property="ItemContainerStyle" Value="{StaticResource TabItemStyle}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="TabControl">
                    <Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                        <Grid x:Name="templateRoot" Background="{TemplateBinding Background}" 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" Background="Transparent" Grid.Column="0" IsItemsHost="true" Margin="0" Grid.Row="0" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1"/>
                            <Border x:Name="contentPanel" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" BorderThickness="0,1,0,0" BorderBrush="{DynamicResource BorderBrush}" 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="0" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            </Border>
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="TabItemCapsuleBaseStyle" TargetType="TabItem">
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Background" Value="{DynamicResource DefaultBrush}"/>
        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="VerticalAlignment" Value="Center"/>
        <Setter Property="controls:BorderElement.CornerRadius" Value="0"/>
        <Setter Property="Height" Value="{StaticResource DefaultControlHeight}"/>
        <Setter Property="Padding" Value="10,0"/>
        <Setter Property="Margin" Value="-1,0,0,0"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="TabItem">
                    <Border x:Name="BorderRoot" CornerRadius="{Binding Path=(controls:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                        <ContentPresenter x:Name="contentPresenter" ContentSource="Header" TextElement.Foreground="{TemplateBinding Foreground}"  Focusable="False" HorizontalAlignment="Center" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center"/>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="TextElement.Foreground" Value="{DynamicResource PrimaryBrush}" TargetName="contentPresenter"/>
                        </Trigger>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter Property="BorderBrush" Value="{Binding Path=(controls:TitleElement.BorderBrush),RelativeSource={RelativeSource TemplatedParent}}" TargetName="BorderRoot"/>
                            <Setter Property="Background" Value="{Binding Path=(controls:TitleElement.Background),RelativeSource={RelativeSource TemplatedParent}}" TargetName="BorderRoot"/>
                            <Setter Property="TextElement.Foreground" Value="{Binding Path=(controls:TitleElement.Foreground),RelativeSource={RelativeSource TemplatedParent}}" TargetName="contentPresenter"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="Panel.ZIndex" Value="{x:Static system:Int32.MaxValue}"/>
            </Trigger>
        </Style.Triggers>
    </Style>

</ResourceDictionary>