如何获得WPF窗口关闭按钮设计？

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="WPF Window with Custom Close Button" Height="450" Width="800">
    <Grid>
        <!-- 标题栏部分 -->
        <Grid Background="#007ACC" Height="30" VerticalAlignment="Top">
            <!-- 关闭按钮 -->
            <Button x:Name="btnClose" Content="X" Foreground="White" Background="Transparent" BorderBrush="Transparent"
                    HorizontalAlignment="Right" VerticalAlignment="Center" Width="30" Height="30"
                    FontSize="16" FontWeight="Bold" Click="btnClose_Click"/>
        </Grid>
        <!-- 窗口内容 -->
        <Grid Margin="10">
            <!-- 在这里添加窗口的内容 -->
        </Grid>
    </Grid>
</Window>