<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<StackPanel.Resources>
<Style TargetType="{x:Type Button}">
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="FontSize" Value="12" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="FontSize"
To="36" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="FontSize"
To="12" Duration="0:0:0.25" />
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
</StackPanel.Resources>
<Button>Button No. 1</Button>
<Button>Button No. 2</Button>
<Button>Button No. 3</Button>
</StackPanel>
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