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Select all text from RichTextBox and cut

<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="350" Width="500">     <DockPanel>         <StackPanel DockPanel.Dock="Top" Orientation="Horizontal">             <StackPanel.Resources>                 <Style TargetType="{x:Type Button}">                     <Setter Property="CommandTarget" Value="{Binding ElementName=rtbTextBox1}" />                 </Style>             </StackPanel.Resources>             <Button Content="Clear" Name="btnClear" Click="btnClear_Click" />             <Separator Margin="5"/>             <Button Content="Cu_t" Command="ApplicationCommands.Cut" />             <Button Content="_Copy" Command="ApplicationCommands.Copy" />             <Button Content="_Paste" Command="ApplicationCommands.Paste" />             <Separator Margin="5"/>             <Button Content="_Undo" Command="ApplicationCommands.Undo" />             <Button Content="_Redo" Command="ApplicationCommands.Redo" />             <Separator Margin="5"/>             <Button Content="_Bold" Command="EditingCommands.ToggleBold" />             <Button Content="_Italic" Command="EditingCommands.ToggleItalic" />             <Button Content="Underline" Command="EditingCommands.ToggleUnderline" />             <Separator Margin="5"/>             <Button Content="_Right" Command="EditingCommands.AlignRight" />             <Button Content="C_enter" Command="EditingCommands.AlignCenter" />             <Button Content="_Left" Command="EditingCommands.AlignLeft" />         </StackPanel>         <RichTextBox DockPanel.Dock="Bottom" Name="rtbTextBox1"                      HorizontalScrollBarVisibility="Visible"                       VerticalScrollBarVisibility="Visible">             <FlowDocument>                 <Paragraph FontSize="12">                     paragraph                 </Paragraph>                 <Paragraph FontSize="15">                     paragraph                 </Paragraph>                 <Paragraph FontSize="18">A List</Paragraph>                 <List>                     <ListItem>                         <Paragraph>                             <Bold>Bold List Item</Bold>                         </Paragraph>                     </ListItem>                     <ListItem>                         <Paragraph>                             <Italic>Italic List Item</Italic>                         </Paragraph>                     </ListItem>                     <ListItem>                         <Paragraph>                             <Underline>Underlined List Item</Underline>                         </Paragraph>                     </ListItem>                 </List>             </FlowDocument>         </RichTextBox>     </DockPanel> </Window> //File:Window.xaml.cs using System.Windows; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();         }         private void btnClear_Click(object sender, RoutedEventArgs e)         {             rtbTextBox1.SelectAll();             rtbTextBox1.Cut();         }     } }