为什么paragraph设置了ToolTip，但是把鼠标移动到段落上，ToolTip却没有显示？

            Run rr = new Run("mmmmm");

            rr.Background = Brushes.Green;

            rr.Foreground = Brushes.Red;



            Paragraph pp = new Paragraph();

            pp.ToolTip = "aaa";

            pp.Inlines.Add(rr);



            this.richTextBox2.Document.Blocks.Add(pp);

<Window x:Class="Test.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow">





    <Grid>

        <RichTextBox name="richTextBox2"></RichTextBox>

    </Grid>



</Window>



后台xaml.cs代码：

[code=C#]

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;



namespace Test

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            Run rr = new Run("mmmmm");

            rr.Background = Brushes.Green;

            rr.Foreground = Brushes.Red;



            Paragraph pp = new Paragraph();

            pp.ToolTip = "aaa";

            pp.Inlines.Add(rr);



            this.richTextBox2.Document.Blocks.Add(pp);

        }

     }

} 

<Window x:Class="Test.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow">





    <Grid>

        <RichTextBox name="richTextBox2"></RichTextBox>

    </Grid>



</Window>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;



namespace Test

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            Run rr = new Run("mmmmm");

            rr.Background = Brushes.Green;

            rr.Foreground = Brushes.Red;



            Paragraph pp = new Paragraph();

            pp.ToolTip = "aaa";

            pp.Inlines.Add(rr);



            this.richTextBox2.Document.Blocks.Add(pp);

        }

     }

} 

补充：.NET技术 ,  C#

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