如何在WPF中为选项卡控件提供自定义形状？

<Window x:Class="CustomTabShapeExample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Custom Tab Shape Example" Height="450" Width="800">
    <Window.Resources>
        <Style x:Key="CustomTabStyle" TargetType="TabControl">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="TabControl">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="*"/>
                            </Grid.RowDefinitions>
                            <TabPanel Grid.Row="0" Panel.ZIndex="1" Background="Transparent" IsItemsHost="True"/>
                            <Border Grid.Row="1" BorderBrush="Gray" BorderThickness="1">
                                <ContentPresenter x:Name="PART_SelectedContentHost" ContentSource="SelectedContent"/>
                            </Border>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid>
        <TabControl Style="{StaticResource CustomTabStyle}">
            <TabItem Header="Tab 1">
                <Grid Background="LightGray">
                    <!-- Tab 1 content -->
                </Grid>
            </TabItem>
            <TabItem Header="Tab 2">
                <Grid Background="LightBlue">
                    <!-- Tab 2 content -->
                </Grid>
            </TabItem>
        </TabControl>
    </Grid>
</Window>