push notification helper library

http://windowsteamblog.com/windows_phone/b/wpdev/archive/2011/01/14/windows-push-notification-server-side-helper-library.aspx
http://create.msdn.com/en-us/education/catalog/article/pnhelp-wp7

main/Libs/PushRecipe_WP7_SL/Source/WindowsPhone.Recipes.Push.Server/Behaviors/IVisualHost.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+namespace WindowsPhone.Recipes.Push.Server.Behaviors
+{
+    public interface IVisualHost
+    {
+        Visual Visual { get; set; }
+    }
+}

main/Libs/PushRecipe_WP7_SL/Source/WindowsPhone.Recipes.Push.Server/Behaviors/VisualBinderBehavior.cs

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+using System;
+using System.Collections;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Interactivity;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.IO;
+
+namespace WindowsPhone.Recipes.Push.Server.Behaviors
+{
+	/// <summary>
+    /// An attached behavior that handle a visual element from the visual tree to associated view-model implementing the <see cref="IVisualHost"/> interface.
+	/// </summary>
+	public class VisualBinderBehavior : Behavior<FrameworkElement>
+	{
+        private IVisualHost _visualHost;
+
+        protected override void OnAttached()
+        {
+            _visualHost = FindVisualHost();
+            if (_visualHost == null)
+            {
+                throw new InvalidOperationException("Visual host wasn't found in the data context hierarchy.");
+            }
+
+            _visualHost.Visual = AssociatedObject;
+
+            base.OnAttached();
+        }
+
+        protected override void OnDetaching()
+        {
+            _visualHost.Visual = null;
+
+            base.OnDetaching();
+        }
+
+        private IVisualHost FindVisualHost()
+        {
+            DependencyObject targetObject = AssociatedObject;
+            IVisualHost visualHost = AssociatedObject.DataContext as IVisualHost;
+            while (targetObject != null)
+            {
+                if (visualHost != null)
+                {
+                    return visualHost;
+                }
+
+                targetObject = VisualTreeHelper.GetParent(targetObject);
+            }
+
+            return null;
+        }       
+	}
+}