WPF NotifyIcon

--------------
FIX   Removed debug output in WindowMessageSink.
CHG   Major rework on sample project.

git-svn-id: https://svn.evolvesoftware.ch/repos/evolve.net/WPF/NotifyIcon@104 9f600761-6f11-4665-b6dc-0185e9171623

Source/Sample Project/Showcase/FancyPopup.xaml.cs

@@ -0,0 +1,46 @@
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Samples
+{
+  /// <summary>
+  /// Interaction logic for FancyPopup.xaml
+  /// </summary>
+  public partial class FancyPopup : UserControl
+  {
+    #region ClickCount dependency property
+
+    /// <summary>
+    /// The number of clicks on the popup button.
+    /// </summary>
+    public static readonly DependencyProperty ClickCountProperty =
+        DependencyProperty.Register("ClickCount",
+                                    typeof (int),
+                                    typeof (FancyPopup),
+                                    new FrameworkPropertyMetadata(0));
+
+    /// <summary>
+    /// A property wrapper for the <see cref="ClickCountProperty"/>
+    /// dependency property:<br/>
+    /// The number of clicks on the popup button.
+    /// </summary>
+    public int ClickCount
+    {
+      get { return (int) GetValue(ClickCountProperty); }
+      set { SetValue(ClickCountProperty, value); }
+    }
+
+    #endregion
+
+    public FancyPopup()
+    {
+      InitializeComponent();
+    }
+
+    private void OnButtonClick(object sender, RoutedEventArgs e)
+    {
+      //just increment a counter - will be displayed on screen
+      ClickCount++;
+    }
+  }
+}