Use CommandBinding to Bind to ApplicationCommands

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<Window x:Class="Commands.SimpleDocument"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="SimpleDocument" Height="300" Width="300">
    <Grid>
      <Grid.RowDefinitions>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition></RowDefinition>
      </Grid.RowDefinitions>
      <Menu Grid.Row="0">
        <MenuItem Header="File">
          <MenuItem Command="New"></MenuItem>
          <MenuItem Command="Open"></MenuItem>
          <MenuItem Command="Save"></MenuItem>
          <MenuItem Command="SaveAs"></MenuItem>
          <Separator></Separator>
          <MenuItem Command="Close"></MenuItem>
        </MenuItem>
      </Menu>

      <ToolBarTray Grid.Row="1">
        <ToolBar>
        <Button Command="New">New</Button>
          <Button Command="Open">Open</Button>
          <Button Command="Save">Save</Button>        
      </ToolBar>
        <ToolBar>
          <Button Command="Cut">Cut</Button>
          <Button Command="Copy">Copy</Button>
          <Button Command="Paste">Paste</Button>
          
        </ToolBar>
      </ToolBarTray>
      <TextBox Name="txt" Margin="5" Grid.Row="2" 
               TextWrapping="Wrap" AcceptsReturn="True"
               TextChanged="txt_TextChanged"></TextBox>
    </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 Commands
{
    public partial class SimpleDocument : System.Windows.Window
    {
        public SimpleDocument()
        {
            InitializeComponent();

            CommandBinding binding;
            binding = new CommandBinding(ApplicationCommands.New);
            binding.Executed += NewCommand;
            this.CommandBindings.Add(binding);

            binding = new CommandBinding(ApplicationCommands.Open);
            binding.Executed += OpenCommand;
            this.CommandBindings.Add(binding);

            binding = new CommandBinding(ApplicationCommands.Save);
            binding.Executed += SaveCommand_Executed;
            binding.CanExecute += SaveCommand_CanExecute;
            this.CommandBindings.Add(binding);
        }

        private void NewCommand(object sender, ExecutedRoutedEventArgs e)
        {
            Console.WriteLine("New command triggered with " + e.Source.ToString());
            isDirty = false;          
        }

        private void OpenCommand(object sender, ExecutedRoutedEventArgs e)
        {
            isDirty = false;
        }

        private void SaveCommand_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            Console.WriteLine("Save command triggered with " + e.Source.ToString());
            isDirty = false;
        }

        private bool isDirty = false;
        private void txt_TextChanged(object sender, RoutedEventArgs e)
        {
            isDirty = true;
        }

        private void SaveCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {            
            e.CanExecute = isDirty;
        }

    }
}