关于WPF中RichTextBox失去焦点后如何保持高亮显示所选择的内容

其实很简单，只要将容器控件中的附加属性FocusManager.IsFocusScope设为True就可以了

下面是个简单的用例：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="" Width="">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height=""/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <StackPanel Grid.Row="" Orientation="Horizontal" FocusManager.IsFocusScope="True">
            <ComboBox Width="">
                <ComboBoxItem></ComboBoxItem>
                <ComboBoxItem></ComboBoxItem>
                <ComboBoxItem></ComboBoxItem>
            </ComboBox>
            <ComboBox Width="">
                <ComboBoxItem>a</ComboBoxItem>
                <ComboBoxItem>b</ComboBoxItem>
                <ComboBoxItem>c</ComboBoxItem>
            </ComboBox>
        </StackPanel>
        <RichTextBox Grid.Row=""/>
    </Grid>
</Window>

以下是运行效果图