SilverlightでEnterイベントを使用する

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using GTA.Teaching.UI.Silverlight.ViewModels;

namespace GTA.Teaching.UI.Silverlight.Views.MainPage
{
    public partial class Login : UserControl
    {
        LoginViewModel vm;
        public Login()
        {
            InitializeComponent();
           vm= (LoginViewModel)this.DataContext;
        }

        private void Grid_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                vm.Login();
            }
        }

        private void TextBox_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                vm.CurrentLoginAccount = loginname.Text;
            }
        }

        private void PasswordBox_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                vm.CurrentPassword = loginpwd.Password;
            }
        }
    }
}

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