title: ColorAnimation change color in rectangle
body: <p>I want change rectange color, but, color doesn't change. Where is problem?</p>
  
  <pre><code>ColorAnimation col = new ColorAnimation();
  col.From = Colors.Aqua;
  col.To = Colors.PaleGreen;
  col.Duration = new Duration(TimeSpan.FromSeconds(1));
  
  Storyboard zgo = new Storyboard();
  Storyboard.SetTarget(col, c);
  Storyboard.SetTargetProperty(col,
             new PropertyPath(SolidColorBrush.ColorProperty));
  zgo.Children.Add(col);
  zgo.Begin();
  </code></pre>
  
  <p>And here is XAML:</p>
  
  <pre><code>&lt;Rectangle Name="rec"
      Height="100" Width="200"
      HorizontalAlignment="Left" VerticalAlignment="Top"
      Stroke="Black"
      MouseLeftButtonDown="rec_MouseLeftButtonDown"&gt;
      &lt;Rectangle.Fill&gt;
          &lt;SolidColorBrush x:Name="c"&gt;&lt;/SolidColorBrush&gt;
      &lt;/Rectangle.Fill&gt;
  &lt;/Rectangle&gt;
  </code></pre>