title: How to set Animation WPF Border without setting a name
body: <p>I have this:</p>
  <pre><code>&lt;Border.Triggers&gt;
      &lt;EventTrigger RoutedEvent=&quot;Border.MouseEnter&quot;&gt;
          &lt;EventTrigger.Actions&gt;
              &lt;BeginStoryboard&gt;
                  &lt;Storyboard TargetProperty=&quot;Background&quot;&gt;
                      &lt;ColorAnimation From=&quot;Red&quot; To=&quot;Green&quot; Duration=&quot;0:0:2&quot; AutoReverse=&quot;True&quot; RepeatBehavior=&quot;Forever&quot; /&gt;
                  &lt;/Storyboard&gt;
              &lt;/BeginStoryboard&gt;
          &lt;/EventTrigger.Actions&gt;
      &lt;/EventTrigger&gt;
  &lt;/Border.Triggers&gt;
  </code></pre>
  <p>I want to change the background when hovering over with mouse, like gradientstop or simple colors, but I get errors. And where to lookup which dependency properties I have to use at <code>TargetProperty</code>.</p>
  <p>for example this doesnt work either</p>
  <pre><code>&lt;Grid.Triggers&gt;
                              &lt;EventTrigger RoutedEvent=&quot;Grid.Loaded&quot;&gt;
                                  &lt;EventTrigger.Actions&gt;
                                      &lt;BeginStoryboard&gt;
                                          &lt;Storyboard TargetProperty=&quot;Background.GradientStops[1].Color&quot;&gt;
                                              &lt;ColorAnimation From=&quot;Red&quot;
                                                              To=&quot;Green&quot;
                                                              Duration=&quot;0:0:2&quot;
                                                              AutoReverse=&quot;True&quot;
                                                              RepeatBehavior=&quot;Forever&quot; /&gt;
                                          &lt;/Storyboard&gt;
                                      &lt;/BeginStoryboard&gt;
                                      &lt;BeginStoryboard&gt;
                                          &lt;Storyboard TargetProperty=&quot;Background.GradientStops[1].Offset&quot;&gt;
                                              &lt;DoubleAnimation From=&quot;0&quot;
                                                               To=&quot;1&quot;
                                                               Duration=&quot;0:0:2&quot;
                                                               AutoReverse=&quot;True&quot;
                                                               RepeatBehavior=&quot;Forever&quot;/&gt;
                                          &lt;/Storyboard&gt;
                                      &lt;/BeginStoryboard&gt;
                                  &lt;/EventTrigger.Actions&gt;
                              &lt;/EventTrigger&gt;
                          &lt;/Grid.Triggers&gt;
  </code></pre>