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'>
    
        
            
                
                                                    TargetProperty="(Canvas.Top)"
                                RepeatBehavior="Forever">
                        
                            
                                                                              KeySpline="0.25 0, 0.6 0.2" />
                                                                              KeySpline="0.75 1, 0.4 0.8" />