<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 RepeatBehavior="Forever">
<ParallelTimeline>
<DoubleAnimation BeginTime="0:0:0" Duration="0:0:0.2"
Storyboard.TargetName="button1"
Storyboard.TargetProperty="(Button.Height)"
By="30" />
<DoubleAnimation BeginTime="0:0:1" Duration="0:0:0.2"
Storyboard.TargetName="button2"
Storyboard.TargetProperty="(Button.Height)"
By="30" />
</ParallelTimeline>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</StackPanel.Triggers>
<Button Name="button1" Height="25">One</Button>
<Button Name="button2" Height="25">Two</Button>
</StackPanel>
</Page>
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