如何为在后台代码中创建的WPF控件附加行为？

public static class MyAttachedProperties
{
    public static readonly DependencyProperty MyPropertyProperty =
        DependencyProperty.RegisterAttached("MyProperty", typeof(string), typeof(MyAttachedProperties), new PropertyMetadata(null));

    public static string GetMyProperty(DependencyObject obj)
    {
        return (string)obj.GetValue(MyPropertyProperty);
    }

    public static void SetMyProperty(DependencyObject obj, string value)
    {
        obj.SetValue(MyPropertyProperty, value);
    }

    public static readonly RoutedEvent MyEvent =
        EventManager.RegisterRoutedEvent("MyEvent", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(MyAttachedProperties));

    public static void AddMyEventHandler(DependencyObject obj, RoutedEventHandler handler)
    {
        var uiElement = obj as UIElement;
        if (uiElement != null)
        {
            uiElement.AddHandler(MyEvent, handler);
        }
    }

    public static void RemoveMyEventHandler(DependencyObject obj, RoutedEventHandler handler)
    {
        var uiElement = obj as UIElement;
        if (uiElement != null)
        {
            uiElement.RemoveHandler(MyEvent, handler);
        }
    }
}

<Window x:Class="MyApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:MyApp"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Button local:MyAttachedProperties.MyProperty="Hello World"
                local:MyAttachedProperties.MyEvent="Button_Click"
                Content="Click Me" />
    </Grid>
</Window>

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        var button = sender as Button;
        if (button != null)
        {
            string myProperty = MyAttachedProperties.GetMyProperty(button);
            // 处理附加属性

            // 触发附加事件
            button.RaiseEvent(new RoutedEventArgs(MyAttachedProperties.MyEvent));
        }
    }
}