public SettingsPartViewModel()
 {
     if (Windows.ApplicationModel.DesignMode.DesignModeEnabled)
     {
         // designtime
     }
     else
     {
         _settings = Helpers.SettingsHelper.SettingsHelper.Instance;
     }
 }
 public Shell()
 {
     Instance = this;
     InitializeComponent();
     _settings = Helpers.SettingsHelper.SettingsHelper.Instance;
 }