Four Sided Bounce
<UserControl x:Class='SilverlightApplication3.MainPage' 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'> <Ellipse Name="elips" Fill="Blue" Width="8" Height="8" /> <UserControl.Triggers> <EventTrigger RoutedEvent="Canvas.SizeChanged"> <BeginStoryboard> <Storyboard TargetName="elips"> <DoubleAnimation Storyboard.TargetProperty="(Canvas.Left)" BeginTime="-0:0:1" Duration="0:0:2" RepeatBehavior="Forever" AutoReverse="True" From="0" To="{Binding ElementName=canv, Path=ActualWidth}" /> <DoubleAnimation Storyboard.TargetProperty="(Canvas.Top)" Duration="0:0:2" RepeatBehavior="Forever" AutoReverse="True" From="0" To="{Binding ElementName=canv, Path=ActualHeight}" /> </Storyboard> </BeginStoryboard> </EventTrigger> </UserControl.Triggers> </UserControl>