WPF EventTrigger,BeginStoryboard

<Window x:Class="WpfApplication2.LoginWind"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="LoginWind"
Height="333" Width="459" WindowStyle="None" Background="White" MouseLeftButtonDown="Window_MouseLeftButtonDown"
RenderTransformOrigin="0.5,0.5"> <Grid RenderTransformOrigin="0.5,0.5">
<Grid.RenderTransform>
<ScaleTransform x:Name="t" ScaleX="1" ScaleY="1"> </ScaleTransform>
</Grid.RenderTransform>
<Grid.Triggers>
<EventTrigger RoutedEvent="Loaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation From="0.5" To="1" Storyboard.TargetName="t" Storyboard.TargetProperty="ScaleX" Duration="0:0:2"> <DoubleAnimation.EasingFunction>
<ElasticEase Oscillations="3"/>
</DoubleAnimation.EasingFunction>
</DoubleAnimation>
<DoubleAnimation From="0.5" To="1" Storyboard.TargetName="t" Storyboard.TargetProperty="ScaleY" Duration="0:0:2"> <DoubleAnimation.EasingFunction>
<ElasticEase Oscillations="3"/>
</DoubleAnimation.EasingFunction>
</DoubleAnimation> </Storyboard> </BeginStoryboard>
</EventTrigger>
</Grid.Triggers> <Button Content="Button" Height="28" HorizontalAlignment="Left" Margin="178,235,0,0" Name="button1" VerticalAlignment="Top" Width="90" Click="button1_Click" />
<Image Height="93" Name="image1" Stretch="UniformToFill" VerticalAlignment="Top" Source="/WpfApplication2;component/Images/Penguins.jpg">
<Image.OpacityMask>
<LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5">
<GradientStop Color="Black" Offset="1" />
<GradientStop Color="Transparent" Offset="0.244" />
</LinearGradientBrush>
</Image.OpacityMask>
</Image>
<Label FontSize="33" FontWeight="Bold" Content="Wo zhu tool" Height="65" HorizontalAlignment="Left" Margin="12,7,0,0" Name="label1" VerticalAlignment="Top" Width="322" Foreground="#FFCB3939" />
<TextBox Height="33" HorizontalAlignment="Left" Margin="125,136,0,0" Name="textBox1" VerticalAlignment="Top" Width="192" />
<TextBox Height="32" HorizontalAlignment="Left" Margin="127,183,0,0" Name="textBox2" VerticalAlignment="Top" Width="190" />
</Grid>
</Window>