Code:
<Grid.Resources> 
  <Storyboard x:Key="MouseLeaveDeck"> 
    <ThicknessAnimation
        Storyboard.TargetName="Deck" 
        Storyboard.TargetProperty="Grid.Thickness"
         To="0,0,0,0" Duration="0:0:0.1"/> 
  </Storyboard> 
</Grid.Resources> 
<Grid.Triggers> 
  <EventTrigger RoutedEvent="Grid.MouseLeave"
...