如何制作不会覆盖WPF .XAML中的样式的自定义TextBox

using System.Windows;
using System.Windows.Controls;

public class CustomTextBox : TextBox
{
    public static readonly DependencyProperty CustomStyleProperty =
        DependencyProperty.RegisterAttached("CustomStyle", typeof(Style), typeof(CustomTextBox), new FrameworkPropertyMetadata(null));

    public static void SetCustomStyle(DependencyObject element, Style value)
    {
        element.SetValue(CustomStyleProperty, value);
    }

    public static Style GetCustomStyle(DependencyObject element)
    {
        return (Style)element.GetValue(CustomStyleProperty);
    }
}

<Window x:Class="YourNamespace.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:YourNamespace"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <Style x:Key="CustomTextBoxStyle" TargetType="local:CustomTextBox">
            <!-- 自定义样式的定义 -->
        </Style>
    </Window.Resources>
    <Grid>
        <local:CustomTextBox local:CustomTextBox.CustomStyle="{StaticResource CustomTextBoxStyle}" />
    </Grid>
</Window>