ShakeGestures Instance/Event appears to be "global" throught the WP8 App

So, I have a WP8 app with multiple pages. I'm using ShakeGestures.dll in my app to detect the shakes.

On different pages (except the MainPage.xaml) I have separate-indepenent tasks (that involve the UI to be updated) that need to be performed whenever the "MinimumRequiredMovesForShake" is achieved.

The problem that I am facing is that, once I have traversed through the pages and return to my MainPage.xaml and shake my device, somehow the shake-detection event gets fired up!

Please note that the MainPage.xaml page does not require to detect the shakes as mentioned earlier.

When I repeatedly shake my device, thus satisfying the "MinimumRequiredMovesForShake" multiple times, all the tasks on the separate pages start getting executing!

According to me, either the shake-detection event involved somehow becomes "global" through out my app or the ShakeGestureHelper Instance needs to be "destroyed" when I navigate away from the page.

The code that I am using is:-

    public Page1()
    {
        InitializeComponent();


        ShakeGesturesHelper.Instance.ShakeGesture +=
        new EventHandler<ShakeGestureEventArgs>(Perform_Shakeevent); 
        ShakeGesturesHelper.Instance.MinimumRequiredMovesForShake = 10;
        ShakeGesturesHelper.Instance.Active = true;
    }

private void Perform_Shakeevent(object sender, ShakeGestureEventArgs e)
    {

        Dispatcher.BeginInvoke(() =>
        {
            //Task to be perfomed here.
        });
    }