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.Client/Converters/BoolBrushConverter.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+using System.Windows.Data;
+
+namespace WindowsPhone.Recipes.Push.Client.Converters
+{
+    public class BoolBrushConverter : IValueConverter
+    {
+        private static readonly Brush DisabledBrush = new SolidColorBrush
+        {
+            Color = Colors.Black,
+            Opacity = 0.4
+        };
+        
+        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+        {
+            return object.Equals(value, true) ? null : DisabledBrush;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
+}