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="350" Width="525">

    <Grid>

        <Grid.RowDefinitions>

            <RowDefinition Height="30"/>

            <RowDefinition Height="*"/>

        </Grid.RowDefinitions>

        <StackPanel Grid.Row="0" Orientation="Horizontal" FocusManager.IsFocusScope="True">

            <ComboBox Width="100">

                <ComboBoxItem>1</ComboBoxItem>

                <ComboBoxItem>2</ComboBoxItem>

                <ComboBoxItem>3</ComboBoxItem>

            </ComboBox>

            <ComboBox Width="100">

                <ComboBoxItem>a</ComboBoxItem>

                <ComboBoxItem>b</ComboBoxItem>

                <ComboBoxItem>c</ComboBoxItem>

            </ComboBox>

        </StackPanel>

        <RichTextBox Grid.Row="1"/>

    </Grid>

</Window>

 以下是运行效果图