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TextBox selection changed event

<UserControl x:Class='SilverlightApplication3.MainPage'     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'      mc:Ignorable='d'      d:DesignWidth='640'      d:DesignHeight='480'>     <Grid x:Name="LayoutRoot" Background="White">         <StackPanel>             <TextBox Text="ABCDEFGHIJKLMNOPQRSTUVWXYZ"                       Height="100"                       AcceptsReturn="True"                       LostFocus="TextBox_LostFocus"                       SelectionChanged="TextBox_SelectionChanged" />             </StackPanel>     </Grid> </UserControl> //File: Page.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();         }         private void TextBox_SelectionChanged(object sender, RoutedEventArgs e)         {             TextBox t = sender as TextBox;             int st = t.SelectionStart;             int ln = t.SelectionLength;             string strT = t.SelectedText;         }         private void TextBox_LostFocus(object sender, RoutedEventArgs e)         {         }     } }