Wpf UserControl使用 KeyBinding，失效问题

我的问题根源是UserControl未获取相应焦点，在UserControl后台添加如下

public AccountDetailView()

        {

            InitializeComponent();

            this.IsEnabledChanged +=new DependencyPropertyChangedEventHandler(AccountDetailView_IsEnabledChanged);  

        }

        private void control_detail_Loaded(object sender, RoutedEventArgs e)

        {

            tb_detail.Focusable = true;

            Keyboard.Focus(this);

        }

        void AccountDetailView_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)

        {

            if (!Convert.ToBoolean(e.NewValue)) return;

            this.Focusable = true;

            Keyboard.Focus(this);

        }