title: WPF TextBlock text changed notify
body: <p>I have a screen contain about 15-20 TextBlocks each one bind to a different property, at first all the TextBlocks are empty the text update come from other client.</p>
  
  <p>The thing I want to do is to animate flashing text for 3 seconds when ever text change.</p>
  
  <p>I used the below storyboard to make that happen:    </p>
  
  <p></p>
  
  <pre><code>    &lt;Setter Property="Visibility" Value="Visible"/&gt;
  
         &lt;Style.Triggers&gt;
          &lt;EventTrigger RoutedEvent="UIElement.MouseEnter"&gt;  
  
              &lt;BeginStoryboard &gt;
                  &lt;Storyboard Duration="0:0:03"&gt;
                      &lt;ObjectAnimationUsingKeyFrames BeginTime="00:00:00"  Storyboard.TargetProperty="(UIElement.Visibility)"&gt;
                          &lt;DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Visible}"/&gt;
                          &lt;DiscreteObjectKeyFrame KeyTime="00:00:00.5" Value="{x:Static Visibility.Hidden}"/&gt;
                          &lt;DiscreteObjectKeyFrame KeyTime="00:00:01" Value="{x:Static Visibility.Visible}"/&gt;
                          &lt;DiscreteObjectKeyFrame KeyTime="00:00:01.5" Value="{x:Static Visibility.Hidden}"/&gt;
                          &lt;DiscreteObjectKeyFrame KeyTime="00:00:02" Value="{x:Static Visibility.Visible}"/&gt;
                          &lt;DiscreteObjectKeyFrame KeyTime="00:00:02.5" Value="{x:Static Visibility.Hidden}"/&gt;
                          &lt;DiscreteObjectKeyFrame KeyTime="00:00:03" Value="{x:Static Visibility.Visible}"/&gt;
                      &lt;/ObjectAnimationUsingKeyFrames&gt;
                 &lt;/Storyboard&gt;
              &lt;/BeginStoryboard&gt;
          &lt;/EventTrigger&gt;
      &lt;/Style.Triggers&gt;
  &lt;/Style&gt;
  </code></pre>
  
  <p>Using the mouse enter event the text flash is fine but using the <code>Binding.TargetUpdated</code> event didn't trigger anything.</p>
  
  <p>Anyone know about event that raise when the <code>TextBlock</code> text is changed ?  </p>