WPF VB.Net

      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
    
      
        
          
            
                               Storyboard.TargetProperty="(Ellipse.Fill).(SolidColorBrush.Color)"
                 Duration="0:0:7" From="Red" To="Purple"
                 RepeatBehavior="Forever" AutoReverse="True" />