WPF 给控件添加自定义事件

在做一个聊天程序 如何在好友发消息过来，让<Image>晃动？感觉要用自定义事件，其他方法也行

<ListBox Name="userList" Grid.Column="1" ScrollViewer.VerticalScrollBarVisibility="Auto" MouseDoubleClick="userList_MouseDoubleClick">
  <ListBox.ItemTemplate>
  <DataTemplate>
  <Canvas Tag="{Binding FriendId}" Height="36" Width="212">
  <Image Name="image" Height="34" Width="34" Source="{Binding FacePath}" />
  <TextBlock Canvas.Left="42" Canvas.Top="2" VerticalAlignment="Center" Text="{Binding FriendId}"></TextBlock>
  <TextBlock Canvas.Left="42" Canvas.Top="23" VerticalAlignment="Center" Text="{Binding NickName}"></TextBlock>
  </Canvas>
  </DataTemplate>
  </ListBox.ItemTemplate>
</ListBox>

http://www.cnblogs.com/zhouyinhui/archive/2007/10/27/939920.html