<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Name="canv">
<Ellipse Name="elips" Fill="Blue" Width="8" Height="8" />
<Canvas.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>
</Canvas.Triggers>
</Canvas>
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