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

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VB.Net Tutorial » Windows Presentation Foundation » Command 
16.89.9.Press F1 to get help
<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
WPF Press F1 To Get Help
16.89.Command
16.89.1.Invoking Copy command with a ButtonInvoking Copy command with a Button
16.89.2.Button CommandTarget BindingButton CommandTarget Binding
16.89.3.Creating CommandBinding and attaching an Executed and CanExecute handlerCreating CommandBinding and attaching an Executed and CanExecute handler
16.89.4.Command Handler Command Binding in XamlCommand Handler Command Binding in Xaml
16.89.5.Property changed callbackProperty changed callback
16.89.6.Using CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler methodUsing CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler method
16.89.7.Create CommandBindings in Xaml and bind to ButtonCreate CommandBindings in Xaml and bind to Button
16.89.8.Bind TextBox save command to CommandBindingBind TextBox save command to CommandBinding
16.89.9.Press F1 to get helpPress F1 to get help
16.89.10.Help commandHelp command
16.89.11.Command EnablingCommand Enabling
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