WP8 compass app issue - windows-phone-8

I am learning the WP8 development. I am trying to incorporate compass in my application. I have found nice tutorial online but I have one issue with this piece of code
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 Microsoft.Phone.Controls;
using Microsoft.Devices.Sensors;
namespace PhoneApp4
{
public partial class CompassScreen : PhoneApplicationPage
{
Compass compass = new Compass();
RotateTransform transform = new RotateTransform();
double TrueHeading;
double ReciprocalHeading;
double HeadingAccuracy;
bool Alphabetic = false; //alpha output setting, default is false
bool Calibrating = false;
// Constructor
public CompassScreen()
{
try
{
InitializeComponent();
compass.CurrentValueChanged += new EventHandler<SensorReadingEventArgs<CompassReading>>(compass_CurrentValueChanged);
compass.Calibrate += new EventHandler<CalibrationEventArgs>(compass_Calibrate);
When I do it as a an app that only displays the compass the app works fine, if I want to
incorporate in an app that have few windows it does not work the part ".CurentValueChanged" and ".Calibrate" is underlined in red, the last 2 lines.
compass.CurrentValueChanged
compass.Calibrate
Can you suggest what I am doing wrong?
Thanks
R.

According to the documentation, those events do not exist on the class elaborated for Windows 8 devices. The only event you may listen for (which is equivalent to CurrentValueChanged) is ReadingChanged.

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