<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <StackPanel Orientation="Horizontal" VerticalAlignment="Center"> <StackPanel.Triggers> <EventTrigger RoutedEvent="StackPanel.Loaded"> <BeginStoryboard> <Storyboard> <ParallelTimeline RepeatBehavior="Forever"> <DoubleAnimation BeginTime="0:0:0" Duration="0:0:0.2" Storyboard.TargetName="button1" Storyboard.TargetProperty="(Button.Height)" By="30" AutoReverse="True" /> <DoubleAnimation BeginTime="0:0:1" Duration="0:0:0.2" Storyboard.TargetName="button2" Storyboard.TargetProperty="(Button.Height)" By="30" AutoReverse="True" /> <ParallelTimeline BeginTime="0:0:2"> <DoubleAnimation BeginTime="0:0:0" Duration="0:0:0.2" Storyboard.TargetName="button3" Storyboard.TargetProperty="(Button.Height)" By="30" AutoReverse="True" /> </ParallelTimeline> </ParallelTimeline> </Storyboard> </BeginStoryboard> </EventTrigger> </StackPanel.Triggers> <Button Name="button1" Height="25">One</Button> <Button Name="button2" Height="25">Two</Button> <Button Name="button3" Height="25">Three</Button> </StackPanel> </Page>