/// <summary>
/// On activated callback. It is used in order to continue the application
/// after the user authenticated.
/// </summary>
protected override void OnActivated(IActivatedEventArgs e)
{
    base.OnActivated(e);
 
    ContinuationManager = new Blogger.Common.ContinuationManager();
    var continuationEventArgs = e as IContinuationActivatedEventArgs;
    if (continuationEventArgs != null)
    {
        // Call ContinuationManager to handle continuation activation.
        // The default ContinuationManager (which is documented in
        // http://msdn.microsoft.com/en-us/library/dn631755.aspx) was changed to
        /// handle ONLY authentication.
        // It supports now current window and NOT current active frame.
        ContinuationManager.Continue(continuationEventArgs);
    }
    Window.Current.Activate();
}