Animations Silverlight

    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d' 
    d:DesignWidth='640' 
    d:DesignHeight='480'>
    
    
        
            
                                                To="Red"
                                Duration="00:00:05"
                                AutoReverse="True"
                                RepeatBehavior="Forever"
                                Storyboard.TargetName="MyRectangle"                                
                                Storyboard.TargetProperty="(Rectangle.Fill).(SolidColorBrush.Color)" />
            
        

                           Width="300"
                   Height="200"
                   Fill="Yellow" 
                   Loaded="MyRectangle_Loaded" />
    
    

//File: Page.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
        private void MyRectangle_Loaded(object sender, RoutedEventArgs e)
        {
            ColorAnimationStoryboard.Begin();
        }
    }
}