WPF CheckBox ToolTip Image

<Window x:Class="WpfApp377.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp377"
        mc:Ignorable="d" WindowState="Maximized"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <CheckBox ToolTipService.ShowDuration="3000">
            CheckBox
            <CheckBox.ToolTip>
                <StackPanel>
                    <Label FontWeight="Bold"
                           Background="Blue"
                           Foreground="White">
                        The CheckBox
                    </Label>
                    <TextBlock Padding="10"
                               TextWrapping="WrapWithOverflow"
                               Width="200">
                        CheckBox is a familiar control.
                        But in WPF,it's not much more than a ToggleButton Styled differently!
                    </TextBlock>
                    <Line Stroke="Black"
                          StrokeThickness="5"
                          X2="200"/>
                    <StackPanel Orientation="Horizontal">
                        <Image Margin="2"
                               Source="/Images/1.jpg" Stretch="Fill" Width="800" Height="500"/>
                        <Label FontWeight="Bold">Press F1 for more help.</Label>
                    </StackPanel>
                </StackPanel>
            </CheckBox.ToolTip>
        </CheckBox>
    </Grid>
</Window>

After 3 seconds,the tooltip image will vanish automatically