nature_net.user_controls.signup.user_pin_LostFocus C# (CSharp) Метод

        void user_pin_LostFocus(object sender, RoutedEventArgs e)
        {
            if (!user_pin.numpad_frame.IsFocused)
                if (user_pin.numpad_frame != null)
                    user_pin.numpad_frame.Visibility = System.Windows.Visibility.Collapsed;
        }