Press F1 to get help : Command « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. Command

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Press F1 to get help" Height="250" Width="400">
  <DockPanel>
    <Menu DockPanel.Dock ="Top" HorizontalAlignment="Left" Background="White">
      <MenuItem Header="_Edit">
        <MenuItem Command ="Copy"/>
        <MenuItem Command ="Cut"/>
        <MenuItem Command ="Paste"/>
      </MenuItem>
    </Menu>
    <TextBox AcceptsReturn ="True" Foreground ="Black" Background ="AliceBlue"></TextBox>
  </DockPanel>   
</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 WpfApplication1
  Public Partial Class MainWindow
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()

      Dim helpBinding As New CommandBinding(ApplicationCommands.Help)
      AddHandler helpBinding.CanExecute, AddressOf CanHelpExecute
      AddHandler helpBinding.Executed, AddressOf HelpExecuted
      CommandBindings.Add(helpBinding)
    End Sub

    Private Sub CanHelpExecute(sender As Object, e As CanExecuteRoutedEventArgs)
      e.CanExecute = True
    End Sub
    Private Sub HelpExecuted(sender As Object, e As ExecutedRoutedEventArgs)
      MessageBox.Show("support", "Help!")
    End Sub
  End Class
End Namespace

16.89.Command
	16.89.1.	Invoking Copy command with a Button
	16.89.2.	Button CommandTarget Binding
	16.89.3.	Creating CommandBinding and attaching an Executed and CanExecute handler
	16.89.4.	Command Handler Command Binding in Xaml
	16.89.5.	Property changed callback
	16.89.6.	Using CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler method
	16.89.7.	Create CommandBindings in Xaml and bind to Button
	16.89.8.	Bind TextBox save command to CommandBinding
	16.89.9.	Press F1 to get help
	16.89.10.	Help command
	16.89.11.	Command Enabling