Silverlight ComboBox附加行为

我正在尝试创建一个可以应用于Silverlight组合框的附加行为。

我的行为是:

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

namespace AttachedBehaviours
{
    public class ConfirmChangeBehaviour 
    {

        public static bool GetConfirmChange(Selector cmb)
        {
            return (bool)cmb.GetValue(ConfirmChangeProperty);
        }

        public static void SetConfirmChange(Selector cmb, bool value)
        {
            cmb.SetValue(ConfirmChangeProperty, value);
        }


        public static readonly DependencyProperty ConfirmChangeProperty =
            DependencyProperty.RegisterAttached("ConfirmChange", typeof(bool), typeof(Selector), new PropertyMetadata(true, ConfirmChangeChanged));
        public static void ConfirmChangeChanged(DependencyObject d, DependencyPropertyChangedEventArgs args)
        {
            Selector instance = d as Selector;

            if (args.NewValue is bool == false)
                return;

            if ((bool)args.NewValue)
                instance.SelectionChanged += OnSelectorSelectionChanged;
            else
                instance.SelectionChanged -= OnSelectorSelectionChanged;

        }

        static void OnSelectorSelectionChanged(object sender, RoutedEventArgs e)
        {
            Selector item = e.OriginalSource as Selector;

            MessageBox.Show("Unsaved changes. Are you sure you want to change teams?");    

        }

    }

}

它在XAML中的用法如下:

<UserControl x:Class="AttachedBehaviours.MainPage"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:this="clr-namespace:AttachedBehaviours"
             mc:Ignorable="d">
    <Grid x:Name="LayoutRoot">
        <StackPanel>
            <ComboBox ItemsSource="{Binding Teams}" 
                      this:ConfirmChangeBehaviour.ConfirmChange="true" >
            </ComboBox>
        </StackPanel>
    </Grid>
</UserControl>

我得到一个错误:

元素组合框上的未知属性confirmChangeBehavior.ConfirmChange[行:13位置:65]

Intellisense正在接收行为,为什么在运行时会失败?

作记号

Register()已更改为registeratached()。出现同样的错误。