Growl multi-window support

HandyControlDemo/Window/GrowlDemoWindow.xaml

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+<Window x:Class="HandyControlDemo.Window.GrowlDemoWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"
+        xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+        DataContext="{Binding GrowlDemo,Source={StaticResource Locator}}"
+        Title="{x:Static langs:Lang.GrowlDemo}"
+        Width="800"
+        Height="500">
+    <controls:TransitioningContentControl>
+        <controls:SimplePanel>
+            <StackPanel Margin="32">
+                <WrapPanel HorizontalAlignment="Left" VerticalAlignment="Top">
+                    <Button Command="{Binding InfoCmd}" Content="{x:Static langs:Lang.Info}" Margin="0,5,5,5" Style="{StaticResource ButtonInfo}"/>
+                    <Button Command="{Binding SuccessCmd}" Content="{x:Static langs:Lang.Success}" Margin="5" Style="{StaticResource ButtonSuccess}"/>
+                    <Button Command="{Binding WarningCmd}" Content="{x:Static langs:Lang.Warning}" Margin="5" Style="{StaticResource ButtonWarning}"/>
+                    <Button Command="{Binding ErrorCmd}" Content="{x:Static langs:Lang.Error}" Margin="5" Style="{StaticResource ButtonDanger}"/>
+                    <Button Command="{Binding AskCmd}" Content="{x:Static langs:Lang.Ask}" Margin="5" Background="BlueViolet" Foreground="White"/>
+                    <Button Command="{Binding FatalCmd}" Content="{x:Static langs:Lang.Fatal}" Margin="5,0"/>
+                    <Button Command="{Binding ClearCmd}" Content="{x:Static langs:Lang.Clear}" Margin="5,0,0,0" Style="{StaticResource ButtonPrimary}"/>
+                </WrapPanel>
+                <Button Command="{Binding NewWindowCmd}" Content="{x:Static langs:Lang.NewWindow}" HorizontalAlignment="Left" Margin="0,5,0,0"/>
+            </StackPanel>
+            <controls:ScrollViewer VerticalScrollBarVisibility="Hidden" HorizontalAlignment="Right" IsEnableInertia="True" IsPenetrating="True">
+                <StackPanel Name="GrowlPanel" VerticalAlignment="Top" Margin="0,10,10,10"/>
+            </controls:ScrollViewer>
+        </controls:SimplePanel>
+    </controls:TransitioningContentControl>
+</Window>

HandyControlDemo/Window/GrowlDemoWindow.xaml.cs

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+using System;
+using HandyControl.Controls;
+
+namespace HandyControlDemo.Window
+{
+    public partial class GrowlDemoWindow
+    {
+        public GrowlDemoWindow()
+        {
+            InitializeComponent();
+        }
+
+        protected override void OnActivated(EventArgs e)
+        {
+            base.OnActivated(e);
+
+            Growl.SetGrowlParent(GrowlPanel, true);
+        }
+
+        protected override void OnDeactivated(EventArgs e)
+        {
+            base.OnDeactivated(e);
+
+            Growl.SetGrowlParent(GrowlPanel, false);
+        }
+    }
+}