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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.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 WpfApplication1 {   public partial class MainWindow : System.Windows.Window   {     public MainWindow()     {       InitializeComponent();       CommandBinding helpBinding = new CommandBinding(ApplicationCommands.Help);       helpBinding.CanExecute += CanHelpExecute;       helpBinding.Executed += HelpExecuted;       CommandBindings.Add(helpBinding);     }     private void CanHelpExecute(object sender, CanExecuteRoutedEventArgs e)     {       e.CanExecute = true;     }     private void HelpExecuted(object sender, ExecutedRoutedEventArgs e)     {       MessageBox.Show("support", "Help!");     }   } }