<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
HorizontalAlignment="Center" VerticalAlignment="Center">
<Ellipse Name="myEllipse" Fill="Red" Height="100" Width="10">
<Ellipse.Triggers>
<EventTrigger RoutedEvent="Ellipse.MouseEnter">
<BeginStoryboard Name="changeWidth">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="(Ellipse.Width)"
To="300" Duration="0:0:5" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="Ellipse.MouseLeftButtonDown">
<PauseStoryboard BeginStoryboardName="changeWidth" />
</EventTrigger>
</Ellipse.Triggers>
</Ellipse>
</Page>
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