public ItemPage()
{
InitializeComponent();
navigationHelper = new NavigationHelper(this);
navigationHelper.LoadState += NavigationHelper_LoadState;
navigationHelper.SaveState += NavigationHelper_SaveState;
}
public PivotPage()
{
InitializeComponent();
NavigationCacheMode = NavigationCacheMode.Required;
navigationHelper = new NavigationHelper(this);
navigationHelper.LoadState += NavigationHelper_LoadState;
navigationHelper.SaveState += NavigationHelper_SaveState;
}