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Set TextBox to editable

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="WPF" Height="300" Width="300">     <StackPanel>         <TextBox AcceptsReturn="True" Height="100" IsReadOnly="True"                   Name="textBox1" TextAlignment="Left" TextWrapping="Wrap"                   VerticalScrollBarVisibility="Auto">             Default starting text.         </TextBox>         <Grid>             <Grid.ColumnDefinitions>                 <ColumnDefinition/>                 <ColumnDefinition/>             </Grid.ColumnDefinitions>             <RadioButton Checked="EditableChecked" Grid.Column="0"                           HorizontalAlignment="Center" IsChecked="True"                          Margin="5" Name="editableRadioButton" >                 Editable</RadioButton>             <RadioButton Checked="EditableChecked" Grid.Column="1"                           HorizontalAlignment="Center" Margin="5"                          Name="readonlyRadioButton">                 Read Only</RadioButton>         </Grid>     </StackPanel> </Window> //File:Window.xaml.cs using System.Windows; using System.Windows.Controls; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();         }         private void EditableChecked(object sender, RoutedEventArgs e)         {             RadioButton button = e.OriginalSource as RadioButton;             if (e.OriginalSource == editableRadioButton)             {                 textBox1.IsReadOnly = false;             }             else if (e.OriginalSource == readonlyRadioButton)             {                 textBox1.IsReadOnly = true;             }             textBox1.Focus();         }     } }