What is the method for animating the BorderThickness of a Button in WPF?

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One way to animate the BorderThickness of a Button in WPF is to use the DoubleAnimation and Storyboard classes. Here's an example code snippet:

<Button x:Name="MyButton" Content="Click Me">
    <Button.Style>
        <Style TargetType="Button">
            <Setter Property="BorderThickness" Value="2"/>
            <Style.Triggers>
                <EventTrigger RoutedEvent="Loaded">
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetProperty="BorderThickness"
                                             From="2" To="8" Duration="0:0:1"
                                             AutoReverse="True" RepeatBehavior="Forever"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

In this example, we first set the initial BorderThickness value of the button to 2. Then, we define a Storyboard that contains a DoubleAnimation which targets the BorderThickness property of the button. The animation starts from a value of 2 and goes up to 8, and has a duration of 1 second. We also set AutoReverse to True and RepeatBehavior to Forever, so the animation will oscillate between 2 and 8 pixels. Finally, we use an EventTrigger on the Loaded event to start the animation when the button is loaded in the window.