在视觉工作室中设置窗口样式

我的问题是，我创建了一个文本框，当有人点击它时，它会加粗。我希望当我单击屏幕上的其他地方时它不加粗。现在，这是我需要在样式表中执行此操作的困难部分，并且.cs表连接到样式表。我的.cs表的内容是

using System.Windows;
using System.Windows.Input;
namespace SimTechGUI
{
    public partial class MyResourceDictionary : ResourceDictionary
{ 
   public MyResourceDictionary()
   {
      InitializeComponent();
   }
   private void Window_Focus(object sender, MouseButtonEventArgs e)
   {
       Keyboard.ClearFocus();
   }
}
}

我的 xaml 样式表看起来像

<ResourceDictionary      xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"  
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                x:Class="SimTechGUI.MyResourceDictionary"
                x:ClassModifier="public">
<Style TargetType="{x:Type Window}">
    <EventSetter Event="MouseDown" Handler="Window_Focus" />
</Style>

<Style TargetType="{x:Type TextBox}">
    <Setter Property="SnapsToDevicePixels" Value="True" />
    <Setter Property="OverridesDefaultStyle" Value="True" />
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="MinWidth" Value="120" />
    <Setter Property="MinHeight" Value="25" />
    <Setter Property="AllowDrop" Value="true" />
    <Setter Property="FontSize" Value="16"/>
    <Setter Property="FontFamily" Value="Arial"/>
    <Setter Property="VerticalContentAlignment" Value="Center"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TextBoxBase}">
                <Border Name="Border" CornerRadius="6" Padding="2" BorderBrush="Black" BorderThickness="2,1">
                    <ScrollViewer Margin="0" x:Name="PART_ContentHost" />
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsKeyboardFocusWithin" Value="True">
                        <Setter Property="BorderThickness" TargetName="Border" Value="3"/>                            
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
</ResourceDictionary>

我所拥有的目前不起作用。有谁知道我必须做什么才能完成这项工作。

MouseDown="Window_Focus"

        <Style x:Key="windowStyle" TargetType="Window">
            <EventSetter Event="MouseDown" Handler="Window_Focus" />
        </Style>

Style="{StaticResource windowStyle}"