WaterMark TextBox in Silverlight 5.0

WaterMark TextBox WITHOUT SILVERLIGHT TOOLKIT 

1)  ADD TEXTBOX TO  grid layout 

<TextBox x:Name="TextBox1" HorizontalAlignment="Left" Height="54" TextWrapping="Wrap" Text="Enter Comments..." Width="351" AcceptsReturn="True" VerticalScrollBarVisibility="Auto" Padding="2,2,2,0" GotFocus="TextBox_GotFocus_1" LostFocus="TextBox_LostFocus_1"/>

2)  ADD EVENTS   GetFocus & LostFocus


private void TextBox_GotFocus_1(object sender, RoutedEventArgs e)
        {
            TextBox1.Text = "";
            
        }


private void TextBox_LostFocus_1(object sender, RoutedEventArgs e)
        {
            if (String.IsNullOrEmpty(TextBox1.Text))
            {
                TextBox1.Text = "Enter Comments Here...";
            }
        }