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/WelcomeBalloon.xaml

@@ -0,0 +1,93 @@
+<UserControl
+  x:Class="Samples.WelcomeBalloon"
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+  xmlns:tb="http://www.hardcodet.net/taskbar"
+  Height="130"
+  Width="283"
+  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+  mc:Ignorable="d"
+  x:Name="me">
+  <UserControl.Resources>
+    <Storyboard
+      x:Key="FadeInAndOut">
+      <DoubleAnimationUsingKeyFrames
+        BeginTime="00:00:00"
+        Storyboard.TargetName="grid"
+        Storyboard.TargetProperty="(UIElement.Opacity)">
+        <SplineDoubleKeyFrame
+          KeyTime="00:00:00"
+          Value="0" />
+        <SplineDoubleKeyFrame
+          KeyTime="00:00:01"
+          Value="0.895" />
+        <SplineDoubleKeyFrame
+          KeyTime="00:00:10"
+          Value="0.895" />
+        <SplineDoubleKeyFrame
+          KeyTime="00:00:11.6000000"
+          Value="0" />
+      </DoubleAnimationUsingKeyFrames>
+    </Storyboard>
+  </UserControl.Resources>
+  <UserControl.Triggers>
+    <EventTrigger
+      RoutedEvent="tb:TaskbarIcon.BalloonShowing">
+      <BeginStoryboard
+        Storyboard="{StaticResource FadeInAndOut}"
+        x:Name="FadeInAndOut_BeginStoryboard" />
+    </EventTrigger>
+  </UserControl.Triggers>
+  <Grid
+    x:Name="grid">
+
+    <Border
+      x:Name="border"
+      CornerRadius="10,10,10,10"
+      Margin="0,0,5,5">
+      <Border.Background>
+        <LinearGradientBrush
+          EndPoint="0.5,1"
+          StartPoint="0.5,0">
+          <GradientStop
+            Color="#FFEEEEEE"
+            Offset="1" />
+          <GradientStop
+            Color="#FFFB6B42"
+            Offset="0" />
+        </LinearGradientBrush>
+      </Border.Background>
+      <Border.Effect>
+        <DropShadowEffect />
+      </Border.Effect>
+    </Border>
+    <TextBlock
+      Margin="10,10,15,0"
+      VerticalAlignment="Top"
+      FontSize="14"
+      FontWeight="Bold"
+      TextWrapping="Wrap"
+      HorizontalAlignment="Center"><Run
+        Text="WPF NotifyIcon - Sample Application"
+        Language="de-ch" /></TextBlock>
+    <TextBlock
+      Margin="10,38.62,10,0"
+      VerticalAlignment="Top"
+      TextWrapping="Wrap"
+      HorizontalAlignment="Left"><Run
+        Text="You should see this icon in your system tray:" /><Run
+        Text=" " /><InlineUIContainer>
+    			<Image
+          Source="{Binding Path=IconSource}"
+          Width="16"
+          Height="16" />
+    		</InlineUIContainer><LineBreak /><Run
+        Text="This is your NotifyIcon." /><LineBreak /><Run
+        Text="" /><LineBreak /><Run
+        FontSize="10"
+        FontStyle="Italic"
+        Text="You can change the displayed icon by selecting another image in the sample window." /></TextBlock>
+
+  </Grid>
+</UserControl>