Анимации фокуса в WPF

Вот стиль кнопки, который я создал из копии (см. картинку).

    <Style x:Key="FocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Rectangle
                        Margin="2"
                        SnapsToDevicePixels="true"
                        Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"
                        StrokeDashArray="1 2"
                        StrokeThickness="1" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <SolidColorBrush x:Key="Button.Static.Background" Color="#FFDDDDDD" />
    <SolidColorBrush x:Key="Button.Static.Border" Color="#FF707070" />
    <SolidColorBrush x:Key="Button.MouseOver.Background" Color="#FFBEE6FD" />
    <SolidColorBrush x:Key="Button.MouseOver.Border" Color="#FF3C7FB1" />
    <SolidColorBrush x:Key="Button.Pressed.Background" Color="#FFC4E5F6" />
    <SolidColorBrush x:Key="Button.Pressed.Border" Color="#FF2C628B" />
    <SolidColorBrush x:Key="Button.Disabled.Background" Color="#FFF4F4F4" />
    <SolidColorBrush x:Key="Button.Disabled.Border" Color="#FFADB2B5" />
    <SolidColorBrush x:Key="Button.Disabled.Foreground" Color="#FF838383" />
    <Style x:Key="ButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}" />
        <Setter Property="Background" Value="{StaticResource Button.Static.Background}" />
        <Setter Property="BorderBrush" Value="{StaticResource Button.Static.Border}" />
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Padding" Value="1" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border
                        x:Name="border"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="true">
                        <ContentPresenter
                            x:Name="contentPresenter"
                            Margin="{TemplateBinding Padding}"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Focusable="False"
                            RecognizesAccessKey="True"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsDefaulted" Value="true">
                            <Setter TargetName="border" Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" />
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter TargetName="border" Property="Background" Value="{StaticResource Button.MouseOver.Background}" />
                            <Setter TargetName="border" Property="BorderBrush" Value="{StaticResource Button.MouseOver.Border}" />
                        </Trigger>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter TargetName="border" Property="Background" Value="{StaticResource Button.Pressed.Background}" />
                            <Setter TargetName="border" Property="BorderBrush" Value="{StaticResource Button.Pressed.Border}" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter TargetName="border" Property="Background" Value="{StaticResource Button.Disabled.Background}" />
                            <Setter TargetName="border" Property="BorderBrush" Value="{StaticResource Button.Disabled.Border}" />
                            <Setter TargetName="contentPresenter" Property="TextElement.Foreground" Value="{StaticResource Button.Disabled.Foreground}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Тебе нужно отредактировать стиль примерно так:

    <SolidColorBrush x:Key="Button.Static.Background" Color="#FFDDDDDD" />
    <SolidColorBrush x:Key="Button.Static.Border" Color="#FF707070" />
    <SolidColorBrush x:Key="Button.MouseOver.Background" Color="#FFBEE6FD" />
    <SolidColorBrush x:Key="Button.MouseOver.Border" Color="#FF3C7FB1" />
    <SolidColorBrush x:Key="Button.Pressed.Background" Color="#FFC4E5F6" />
    <SolidColorBrush x:Key="Button.Pressed.Border" Color="#FF2C628B" />
    <SolidColorBrush x:Key="Button.Disabled.Background" Color="#FFF4F4F4" />
    <SolidColorBrush x:Key="Button.Disabled.Border" Color="#FFADB2B5" />
    <SolidColorBrush x:Key="Button.Disabled.Foreground" Color="#FF838383" />
    <Style x:Key="ButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="FocusVisualStyle" Value="{x:Null}" />
        <Setter Property="Background" Value="{StaticResource Button.Static.Background}" />
        <Setter Property="BorderBrush" Value="{StaticResource Button.Static.Border}" />
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Padding" Value="1" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border
                        x:Name="border"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="true">
                        <ContentPresenter
                            x:Name="contentPresenter"
                            Margin="{TemplateBinding Padding}"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Focusable="False"
                            RecognizesAccessKey="True"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsDefaulted" Value="true">
                            <Setter TargetName="border" Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" />
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter TargetName="border" Property="Background" Value="{StaticResource Button.MouseOver.Background}" />
                            <Setter TargetName="border" Property="BorderBrush" Value="{StaticResource Button.MouseOver.Border}" />
                        </Trigger>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter TargetName="border" Property="Background" Value="{StaticResource Button.Pressed.Background}" />
                            <Setter TargetName="border" Property="BorderBrush" Value="{StaticResource Button.Pressed.Border}" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter TargetName="border" Property="Background" Value="{StaticResource Button.Disabled.Background}" />
                            <Setter TargetName="border" Property="BorderBrush" Value="{StaticResource Button.Disabled.Border}" />
                            <Setter TargetName="contentPresenter" Property="TextElement.Foreground" Value="{StaticResource Button.Disabled.Foreground}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Вообще достаточно будет проставить вот это значение. Удалять стиль фокуса не обязательно.

    <Setter Property="FocusVisualStyle" Value="{x:Null}" />