<Window x:Class="Animation.BlurringButtons"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="BlurringButtons" Height="300" Width="300">
    <Window.Resources>

        <Style TargetType="{x:Type Button}">
            <Setter Property="HorizontalAlignment" Value="Center"></Setter>
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5"></Setter>
            <Setter Property="Padding" Value="20,15"></Setter>
            <Setter Property="Margin" Value="2"></Setter>
            <Setter Property="Effect">
                <Setter.Value>
                    <BlurEffect Radius="10"></BlurEffect>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <EventTrigger RoutedEvent="Button.MouseEnter">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Effect.Radius"
         To="0" Duration="0:0:0.4"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>

                <EventTrigger RoutedEvent="Button.MouseLeave">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Effect.Radius" To="10"
        Duration="0:0:0.2"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>

            </Style.Triggers>
        </Style>

    </Window.Resources>
    <StackPanel Margin="5">
        <Button>One</Button>
        <Button>Two</Button>
        <Button>Three</Button>
        <Button>Four</Button>
        <TextBlock Name="lbl" Margin="5"></TextBlock>
    </StackPanel>
</Window>
