Animate TextBox Font Size

   
      

<Window x:Class="XamlOnly"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="XamlOnly"
    Height="300" Width="300">
    <Grid>
      <StackPanel>
            <TextBlock Name="textBlock" Margin="5"
                TextAlignment="Center" Height="30"
                Text="{Binding ElementName=textBox,Path=Text}" />
            <TextBox Name="textBox" Margin="5" Width="200"
                TextAlignment="Center" Text="Hello, WPF!" />
            <Button Margin="5" Width="200" Content="Change Text Size">
                <Button.Triggers>


                    <EventTrigger RoutedEvent="Button.Click">
                        <BeginStoryboard>
                            <Storyboard>


                                <DoubleAnimation
                                    Storyboard.TargetName="textBlock"
                                    Storyboard.TargetProperty="FontSize" From="11" To="24"
                                    Duration="0:0:0.2" />


                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                </Button.Triggers>
            </Button>

        </StackPanel>
    </Grid>
</Window>