Repetition duration
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Ellipse Fill="Red" Width="200" Height="100"> <Ellipse.Triggers> <EventTrigger RoutedEvent="Ellipse.Loaded"> <BeginStoryboard> <Storyboard> <DoubleAnimation By="20" Duration="0:0:0.25" Storyboard.TargetProperty="(Ellipse.Width)" RepeatBehavior="0:0:2" /> </Storyboard> </BeginStoryboard> </EventTrigger> </Ellipse.Triggers> </Ellipse> </Page>