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Binding command to ApplicationCommands Redo

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="CommandEnabling" Height="300" Width="300"     >   <Grid>     <Menu VerticalAlignment="Top">       <MenuItem Header="_Edit">         <MenuItem Command="Redo" />       </MenuItem>     </Menu>   </Grid> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; namespace WpfApplication1 {     public partial class Window1 : System.Windows.Window     {         public Window1()         {             InitializeComponent();             CommandBinding redoCommandBinding = new CommandBinding(ApplicationCommands.Redo);             redoCommandBinding.CanExecute += RedoCommandCanExecute;             CommandBindings.Add(redoCommandBinding);         }         void RedoCommandCanExecute(object sender, CanExecuteRoutedEventArgs e)         {             e.CanExecute =  DateTime.Now.Second % 2 > 1;         }     } }