<WpfUI:View.CommandBindings>

        <CommandBinding Command="Help"

                        CanExecute="HelpCanExecute"

                        Executed="HelpExecuted"

                        />

    </WpfUI:View.CommandBindings>

<WpfUI:View.InputBindings>

        <KeyBinding Command="Help" Key="F2" />

        <KeyBinding Command="NotACommand" Key="F1"/>

    </WpfUI:View.InputBindings>

 #region Command

        private void HelpCanExecute(object sender, CanExecuteRoutedEventArgs e)

        {

            e.CanExecute = true;

        }

        private void HelpExecuted(object sender, ExecutedRoutedEventArgs e)

        {

            System.Diagnostics.Process.Start("http://www.baidu.com");

        }

        #endregion Command

  public TallyBookView()

        {

            InitializeComponent();

            this.InputBindings.Add(

                new KeyBinding(ApplicationCommands.Help, new KeyGesture(Key.F2)));

        }