Storyboard: A child with a fill period
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Ellipse Name="myEllipse" Height="100" Fill="Red"> <Ellipse.Triggers> <EventTrigger RoutedEvent="Ellipse.Loaded"> <BeginStoryboard> <Storyboard> <ParallelTimeline Duration="0:0:10" FillBehavior="Stop"> <DoubleAnimation From="10" To="300" Duration="0:0:5" Storyboard.TargetProperty="(Ellipse.Width)" /> </ParallelTimeline> </Storyboard> </BeginStoryboard> </EventTrigger> </Ellipse.Triggers> </Ellipse> </Page>