Help command : Command « Windows Presentation Foundation « VB.Net Tutorial

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VB.Net Tutorial » Windows Presentation Foundation » Command 
16.89.10.Help command
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="AboutDialog"
        Title="About WPF Unleashed" SizeToContent="WidthAndHeight"
        Background="OrangeRed">
  <Window.CommandBindings>
    <CommandBinding Command="Help" CanExecute="HelpCanExecute" Executed="HelpExecuted"/>
  </Window.CommandBindings>
  <StackPanel>
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
      <Button MinWidth="75" Margin="10" Command="Help" Content="{Binding RelativeSource={RelativeSource Self}, Path=Command.Text}"/>
      <Button MinWidth="75" Margin="10">OK</Button>
    </StackPanel>
    <StatusBar>asdf</StatusBar>
  </StackPanel>
</Window>

//File:Window.xaml.vb

Imports System.Windows
Imports System.Windows.Input

Public Partial Class AboutDialog
  Inherits Window
  Public Sub New()
    InitializeComponent()
  End Sub

  Private Sub HelpCanExecute(sender As Object, e As CanExecuteRoutedEventArgs)
    e.CanExecute = True
  End Sub

  Private Sub HelpExecuted(sender As Object, e As ExecutedRoutedEventArgs)
    System.Diagnostics.Process.Start("http://www.java2s.com")
  End Sub
End Class
WPF Help Command
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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