init pr add-notifyicon

HandyControlDemo/UserControl/Controls/ChatBubbleDemoCtl.xaml

@@ -2,8 +2,9 @@
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:userControl="clr-namespace:HandyControlDemo.UserControl"
+             xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"
              Background="{DynamicResource RegionBrush}">
-    <ContentControl>
+    <controls:TransitioningContentControl>
         <StackPanel Orientation="Horizontal" Margin="32">
             <userControl:ChatBox>
                 <userControl:ChatBox.Background>
@@ -16,5 +17,5 @@
                 </userControl:ChatBox.Background>
             </userControl:ChatBox>
         </StackPanel>
-    </ContentControl>
+    </controls:TransitioningContentControl>
 </UserControl>

HandyControlDemo/UserControl/Controls/NotifyIconDemoCtl.xaml

@@ -0,0 +1,8 @@
+<UserControl x:Class="HandyControlDemo.UserControl.NotifyIconDemoCtl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{DynamicResource RegionBrush}">
+    <Grid>
+            
+    </Grid>
+</UserControl>

HandyControlDemo/UserControl/Controls/NotifyIconDemoCtl.xaml.cs

@@ -0,0 +1,10 @@
+namespace HandyControlDemo.UserControl
+{
+    public partial class NotifyIconDemoCtl
+    {
+        public NotifyIconDemoCtl()
+        {
+            InitializeComponent();
+        }
+    }
+}