タブをXP風にしてみた | Codetter（こーどったー）

                <TabControl.Resources>
                    <Style TargetType="TabItem">
                        <Setter Property="Focusable" Value="False"/>
                        <EventSetter Event="PreviewMouseDown" Handler="TabItem_PreviewMouseDown"/>
                        <Setter Property="Template">
                            <Setter.Value>
                                <ControlTemplate TargetType="TabItem">
                                    <Border Name="border"
                                            Margin="0,3,0,0"
                                            Focusable="False"
                                            BorderBrush="Gray"
                                            BorderThickness="1"
                                            CornerRadius="3,3,0,0">
                                        <Border.Background>
                                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                                <GradientStop Color="White" Offset="0" />
                                                <GradientStop Color="#FFEDECE7" Offset="1" />
                                            </LinearGradientBrush>
                                        </Border.Background>

                                        <Grid>
                                            <Grid.RowDefinitions>
                                                <RowDefinition Height="auto"/>
                                                <RowDefinition/>
                                            </Grid.RowDefinitions>

                                            <Border Name="selectedBorder"
                                                    Grid.Row="0"
                                                    BorderThickness="1,1,1,0"
                                                    CornerRadius="3,3,0,0"
                                                    BorderBrush="#FFE68B2C"
                                                    Visibility="Collapsed">
                                                <Rectangle Fill="#FFFFC73C"
                                                           Height="3"/>
                                            </Border>

                                            <ContentPresenter Grid.Row="1"
                                                              ContentSource="Header"
                                                              Margin="10,2,10,2"/>
                                        </Grid>
                                    </Border>

                                    <ControlTemplate.Triggers>
                                        <Trigger Property="IsSelected" Value="True">
                                            <Setter Property="Panel.ZIndex" Value="100" />
                                            <Setter TargetName="border" Property="Background" Value="White" />
                                            <Setter TargetName="border" Property="BorderThickness" Value="1,0,1,0" />
                                            <Setter TargetName="border" Property="Margin" Value="-1,0,-1,0"/>
                                            <Setter TargetName="selectedBorder" Property="Visibility" Value="Visible"/>
                                        </Trigger>
                                    </ControlTemplate.Triggers>
                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </TabControl.Resources>