<Window x:Class="FocusVisualStyle.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <Style x:Key="MyFocusVisualStyle">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Rectangle Margin="-2" StrokeThickness="1" Stroke="Red"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<StackPanel Orientation="Horizontal" Height="24">
    <TextBox Width="96"/>
    <Button Content="Yes" Width="64" FocusVisualStyle="{DynamicResource MyFocusVisualStyle}"/>
    <Button Content="No" Width="64" FocusVisualStyle="{DynamicResource MyFocusVisualStyle}"/>
</StackPanel>

您可以根据自己的喜好进行自定义.这只是一个起点.

编辑：由于这么多人喜欢这个解决方案是另一个例子,它改变了所有按钮和文本框的焦点视觉风格,而没有显式设置每个控件的FocusVisualStyle属性(参见DynamicResource thingy？)在xaml

此外,它还使用动画来改变焦点矩形的颜色.

请享用 ：)

<Window x:Class="FocusVisualStyle.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <Style x:Key="MyFocusVisualStyle">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate >
                    <Rectangle Margin="-2" StrokeThickness="2" RadiusX="2" RadiusY="2" >
                        <Rectangle.Stroke>
                            <SolidColorBrush Color="Red" x:Name="RectangleStroke" />
                        </Rectangle.Stroke>
                        <Rectangle.Triggers>
                            <EventTrigger RoutedEvent="Rectangle.Loaded" >
                                <BeginStoryboard>
                                    <Storyboard>
                                        <ColorAnimation From="Red"
                                                        To="Orange"
                                                        Duration="0:0:0.5" 
                                                        RepeatBehavior="Forever" 
                                                        Storyboard.TargetName="RectangleStroke"
                                                        Storyboard.TargetProperty="Color"/>
                                        <DoubleAnimation To="3" 
                                                         Duration="0:0:0.5"
                                                         RepeatBehavior="Forever"
                                                         Storyboard.TargetProperty="StrokeDashOffset" />
                                    </Storyboard>
                                </BeginStoryboard>
                            </EventTrigger>
                        </Rectangle.Triggers>
                    </Rectangle>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="{x:Type Button}">
        <Setter Property="FocusVisualStyle" Value="{StaticResource MyFocusVisualStyle}" />
    </Style>
    <Style TargetType="{x:Type TextBox}">
        <Setter Property="FocusVisualStyle" Value="{StaticResource MyFocusVisualStyle}" />
    </Style>
</Window.Resources>
<StackPanel Orientation="Horizontal" Height="24">
    <TextBox Width="96"/>
    <Button Content="Yes" Width="64" />
    <Button Content="No" Width="64" />
</StackPanel>

在这里你看到我有一个Button和TextBox的样式,它为这个窗口中的所有按钮和文本框设置了FocusVisualStyle的属性.