Comment puis-je ajouter un filigrane de texte à une zone de texte dans wpf?

Je travaille sur une application wpf.Comment je peux ajouter un filigrane de texte à la textbox et passwordbox?

<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Platforma Smart School 1.0" Height="580" Width="880" 
Icon="/WpfApplication4;component/Images/capturennnnnn12_256px%20%282%291.ico">
<Grid>
<Grid.Background>
<ImageBrush ImageSource="/WpfApplication1;component/Images/
hp-colorful-books-hd-105609.jpg" />
</Grid.Background>
<Rectangle Height="334" HorizontalAlignment="Left" Margin="608,162,0,0" 
Name="rectangle1" Stroke="#FFDBD8D8" VerticalAlignment="Top" Width="222"
Fill="#FFF0F0F0" />
<Button Height="34" HorizontalAlignment="Left" Margin="630,434,0,0"
Name="button1" VerticalAlignment="Top" Width="178" FontSize="13" 
Foreground="#FF555555" />
<TextBox Height="34" HorizontalAlignment="Left" Margin="630,219,0,0" 
Name="textBox1" VerticalAlignment="Top" Width="178" FontSize="14" Text=""
Foreground="#FF7C7A7A"  />
<PasswordBox Height="32" HorizontalAlignment="Left" Margin="630,304,0,0"
Name="passwordBox1" VerticalAlignment="Top" Width="178" FontSize="14"
FontFamily="Segoe UI"/>
<Image Height="134" HorizontalAlignment="Left" Margin="606,12,0,0" 
Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="224"
Source="/WpfApplication1;component/Images/Capture3.PNG" />
<Label Content=" Smart School" Height="31" HorizontalAlignment="Left" 
Margin="251,498,0,0" Name="label1" VerticalAlignment="Top" Width="227" />
</Grid>

OriginalL'auteur Ciupleu Sebastian | 2013-07-09