Animate TextBox Font Size
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<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>
</UserControl>
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