title: Borderbrush coloranimation fade in and out
body: <p>i have a border , and i change it's borderbrush in the run time.
  now i need this border to be glowing all the time, whatever the color was.</p>
  
  <p>i tried this but i have problems. any one can help?</p>
  
  <pre><code>&lt;Border   Name="ActiveBorder"  VerticalAlignment="Stretch" Height="auto"  BorderBrush="Transparent" BorderThickness="2" &gt;
              &lt;Border.Style&gt;
                  &lt;Style TargetType="{x:Type Border}"&gt;
                      &lt;Style.Triggers&gt;
                          &lt;Trigger Property="Visibility" Value="Visible"&gt;
                              &lt;Trigger.EnterActions&gt;
                                  &lt;BeginStoryboard&gt;
                                      &lt;Storyboard&gt;
                                          &lt;ColorAnimation AutoReverse="True" RepeatBehavior="Forever" Storyboard.TargetProperty="BorderBrush" Duration="00:00:01" To="Transparent"&gt;&lt;/ColorAnimation&gt;       
                                      &lt;/Storyboard&gt;
                                  &lt;/BeginStoryboard&gt;
                              &lt;/Trigger.EnterActions&gt;
                          &lt;/Trigger&gt;
                      &lt;/Style.Triggers&gt;
                  &lt;/Style&gt;
          &lt;/Border.Style&gt;
  </code></pre>