Receive Notification When an Animation Completes

   
  
<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="" Height="300" Width="300" Background="Black">
  <Window.Triggers>
    <EventTrigger RoutedEvent="Window.Loaded">
      <BeginStoryboard>
        <Storyboard Completed="Storyboard_Completed">
          <ParallelTimeline Completed="ParallelTimeline_Completed">
            <ColorAnimation Duration="0:0:1" Completed="Animation1_Completed" Storyboard.TargetProperty="Background.Color" To="White" />
            <ColorAnimation Duration="0:0:2" Completed="Animation2_Completed" Storyboard.TargetName="bd" Storyboard.TargetProperty="Background.(SolidColorBrush.Color)" To="Black" />
          </ParallelTimeline>
          <ColorAnimation Duration="0:0:3" Completed="Animation3_Completed" Storyboard.TargetName="rect" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" To="Firebrick" />
        </Storyboard>
      </BeginStoryboard>
    </EventTrigger>
  </Window.Triggers>
  <Border x:Name="bd" Margin="20" Background="HotPink">
    <Rectangle x:Name="rect" Width="100" Height="100" Fill="WhiteSmoke" />
  </Border>

</Window>
//File:Window.xaml.cs

using System;
using System.Windows;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Storyboard_Completed(object sender, EventArgs e)
        {
            MessageBox.Show("Storyboard complete.", "WpfApplication1");
        }

        private void ParallelTimeline_Completed(object sender, EventArgs e)
        {
            MessageBox.Show("ParallelTimeline complete.", "WpfApplication1");
        }

        private void Animation1_Completed(object sender, EventArgs e)
        {
            MessageBox.Show("Animation 1 complete.", "WpfApplication1");
        }

        private void Animation2_Completed(object sender, EventArgs e)
        {
            MessageBox.Show("Animation 2 complete.", "WpfApplication1");
        }

        private void Animation3_Completed(object sender, EventArgs e)
        {
            MessageBox.Show("Animation 3 complete.", "WpfApplication1");
        }
    }
}