Use CommandBinding to Bind to ApplicationCommands

     
<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.vb

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes

Namespace Commands
  Public Partial Class SimpleDocument
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()

      Dim binding As CommandBinding
      binding = New CommandBinding(ApplicationCommands.[New])
      AddHandler binding.Executed, AddressOf NewCommand
      Me.CommandBindings.Add(binding)

      binding = New CommandBinding(ApplicationCommands.Open)
      AddHandler binding.Executed, AddressOf OpenCommand
      Me.CommandBindings.Add(binding)

      binding = New CommandBinding(ApplicationCommands.Save)
      AddHandler binding.Executed, AddressOf SaveCommand_Executed
      AddHandler binding.CanExecute, AddressOf SaveCommand_CanExecute
      Me.CommandBindings.Add(binding)
    End Sub

    Private Sub NewCommand(sender As Object, e As ExecutedRoutedEventArgs)
      Console.WriteLine("New command triggered with " & e.Source.ToString())
      isDirty = False
    End Sub

    Private Sub OpenCommand(sender As Object, e As ExecutedRoutedEventArgs)
      isDirty = False
    End Sub

    Private Sub SaveCommand_Executed(sender As Object, e As ExecutedRoutedEventArgs)
      Console.WriteLine("Save command triggered with " & e.Source.ToString())
      isDirty = False
    End Sub

    Private isDirty As Boolean = False
    Private Sub txt_TextChanged(sender As Object, e As RoutedEventArgs)
      isDirty = True
    End Sub

    Private Sub SaveCommand_CanExecute(sender As Object, e As CanExecuteRoutedEventArgs)
      e.CanExecute = isDirty
    End Sub

  End Class
End Namespace

1.	Without focus scope
2.	Bind ApplicationCommand to a handler
3.	Assign ApplicationCommands.Open to Button
4.	Menu with Application command: cut, copy, paste
5.	Binding command to ApplicationCommands.Redo
6.	Binding Command to ApplicationCommands.New
7.	Bind CanExecute to ApplicationCommands.Save
8.	Binding ApplicationCommands.New Command to your own handler
9.	Change ApplicationCommands.New.Text
10.	Call ApplicationCommands.New.Execute to execute the command directly
11.	Use CommandBinding to bind ApplicationCommands.New in code
12.	Add ApplicationCommands.Cut to TextBox with TextBox.CommandBindings

Use CommandBinding to Bind to ApplicationCommands : ApplicationCommands « Windows Presentation Foundation « VB.Net

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