Can'；t使WPF从UserControl的子控件传递焦点

我定义了一个名为

TouchTextBox

的

UserControl

。我已经让

触摸文本框

在它接收焦点时为

文本框

提供焦点。现在我需要

TouchTextBox

在用户单击另一个控件或按tab键时放弃焦点。下面是一些用于

TouchTextBox

的XAML

<UserControl x:Class="CarSystem.CustomControls.TouchTextBox"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:fps="clr-namespace:FPS.VirtualKeyboard;assembly=FPS.VirtualKeyboard"
             mc:Ignorable="d"
             Focusable="True"
             GotFocus="UserControl_GotFocus">

    <Grid Margin="0">
        <Border BorderBrush="{Binding Path=BorderBrush, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                BorderThickness="{Binding Path=BorderThickness, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"
                FocusManager.IsFocusScope="True"
                VerticalAlignment="{Binding Path=VerticalAlignment, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}">
            <TextBox AcceptsTab="False"
                     AcceptsReturn="False"
                     Background="White" 
                     Cursor="{Binding Path=Cursor, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FlowDirection="{Binding Path=FlowDirection, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontFamily="{Binding Path=FontFamily, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"
                     FontSize="{Binding Path=FontSize, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontStretch="{Binding Path=FontStretch, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontStyle="{Binding Path=FontStyle, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontWeight="{Binding Path=FontWeight, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     GotFocus="TextBox_GotFocus" 
                     HorizontalAlignment="{Binding Path=HorizontalAlignment, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     HorizontalContentAlignment="{Binding Path=HorizontalContentAlignment, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     IsEnabled="{Binding Path=IsEnabled, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     LostFocus="TextBox_LostFocus" 
                     Margin="1" 
                     MaxLength="{Binding Path=MaxLength, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     MaxLines="{Binding Path=MaxLines, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     Name="TextBox" 
                     Text="{Binding Path=Text, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"
                     TextChanged="TextBox_TextChanged" />
        </Border>
        <Popup IsOpen="{Binding Path=PopupIsOpen, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
               Name="KeyboardPopup" 
               PlacementTarget="{Binding Path=PlacementTarget, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}">
            <fps:VirtualKeyboard AutoFill="True" Name="PopupKeyboard" />
        </Popup>
    </Grid>
</UserControl>

此控件用作两个

UserControl

上的子控件，然后在我的

main窗口中使用这些控件。当此控件接收到焦点时，它会按设计显示弹出窗口。但不知何故，当我点击另一个控件或按tab键时，它并没有放弃焦点

我需要做什么改变才能让这一切顺利进行

Tony
我通常使用的解决方法是在我的
UserControl
上设置
IsTabStop=“False”
（以防止切换到
UserControl
本身），然后在
UserControl
内部使用
TemplateBinding
将内部控件的
TabIndex
绑定到
UserControl
的
TabIndex

请参阅此问题：
请向我们展示事件处理程序（LostFocus、GotFoucs）中的代码。这是否回答了您的问题？这是一个骗局。。。被接受的答案只是重复那里的答案。