1

<Window x:Class="WPFExperiments.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPFExperiments" Height="300" Width="300" xmlns:my="clr-namespace:System;assembly=mscorlib">

    <Window.Resources>
        <ControlTemplate x:Key="RoundTab" TargetType="{x:Type TabItem}">
            <Grid SnapsToDevicePixels="True">
                <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="2,1,1,0" CornerRadius="7,0,0,7" Padding="{TemplateBinding Padding}">
                    <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ItemsControl}}}" x:Name="Content" VerticalAlignment="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ItemsControl}}}" Content="{TemplateBinding Header}" ContentSource="Header" ContentTemplate="{TemplateBinding HeaderTemplate}" RecognizesAccessKey="True"/>
                </Border>
            </Grid>
            <ControlTemplate.Triggers>

                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="Background" TargetName="Bd">

                        <Setter.Value>
                            <LinearGradientBrush EndPoint="1,0" StartPoint="0,0">
                                <GradientStop Color="#FFEAF6FD" Offset="0"/>
                                <GradientStop Color="#FFA7D9F5" Offset="1"/>
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                </Trigger>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Panel.ZIndex" Value="1"/>
                    <Setter Property="Background" TargetName="Bd" Value="#FFFFFF">

                    </Setter>
                </Trigger>
                <MultiTrigger>

                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="False"/>
                        <Condition Property="IsMouseOver" Value="True"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="BorderThickness" TargetName="Bd" Value="3"/>
                    <Setter Property="BorderBrush" TargetName="Bd" Value="#FF2B4E5B"/>

                </MultiTrigger>
                <Trigger Property="TabStripPlacement" Value="Bottom">
                    <Setter Property="BorderThickness" TargetName="Bd" Value="1,0,1,1"/>
                </Trigger>
                <Trigger Property="TabStripPlacement" Value="Left">
                    <Setter Property="BorderThickness" TargetName="Bd" Value="1,1,0,1"/>
                </Trigger>
                <Trigger Property="TabStripPlacement" Value="Right">
                    <Setter Property="BorderThickness" TargetName="Bd" Value="0,1,1,1"/>
                </Trigger>
                <MultiTrigger>

                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="True"/>
                        <Condition Property="TabStripPlacement" Value="Top"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Margin" Value="-2,-2,-2,-1"/>
                    <Setter Property="Margin" TargetName="Content" Value="0,0,0,1"/>
                </MultiTrigger>
                <MultiTrigger>

                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="True"/>
                        <Condition Property="TabStripPlacement" Value="Bottom"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Margin" Value="-2,-1,-2,-2"/>
                    <Setter Property="Margin" TargetName="Content" Value="0,1,0,0"/>
                </MultiTrigger>
                <MultiTrigger>

                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="True"/>
                        <Condition Property="TabStripPlacement" Value="Left"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Margin" Value="-2,-2,-1,-2"/>
                    <Setter Property="Margin" TargetName="Content" Value="0,0,1,0"/>
                </MultiTrigger>
                <MultiTrigger>

                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="True"/>
                        <Condition Property="TabStripPlacement" Value="Right"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Margin" Value="-1,-2,-2,-2"/>
                    <Setter Property="Margin" TargetName="Content" Value="1,0,0,0"/>
                    <Setter Property="Background" TargetName="Bd" Value="#FF0000"/>
                </MultiTrigger>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Background" TargetName="Bd" Value="#FF0000"/>
                    <Setter Property="BorderBrush" TargetName="Bd" Value="#FFC9C7BA"/>
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                </Trigger>
                <Trigger Property="IsSelected" Value="False">
                    <Setter Property="Background" TargetName="Bd" Value="#EEEEEE"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Window.Resources>
    <Grid x:Name="LayoutRoot">
        <DockPanel>

            <TabControl TabStripPlacement="Left">

                <TabControl.Resources>
                    <Style TargetType="{x:Type TabItem}">
                        <Setter Property="Padding" Value="5" />
                        <Setter Property="HeaderTemplate">

                            <Setter.Value>
                                <DataTemplate>
                                    <ContentPresenter Content="{TemplateBinding Property=ContentControl.Content}">

                                        <ContentPresenter.LayoutTransform>
                                            <RotateTransform Angle="-90" />
                                        </ContentPresenter.LayoutTransform>
                                    </ContentPresenter>
                                </DataTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </TabControl.Resources>
                <TabItem Name="backgroundcolor2" Header="Tab1" Template="{StaticResource RoundTab}" />

                <TabItem Name="foregroundcolor2" Header="Tab2"  Template="{StaticResource RoundTab}"/>

            </TabControl>
        </DockPanel>
    </Grid>
</Window>