public MenuPageViewModel(HOPage root, INavigation navigation = null)
: base(navigation)
{
_sponsorService = DependencyService.Get <ISponsorService>();
_menuService = DependencyService.Get <IMenuService>();
_root = root;
MenuItems = _menuService.GetMenus();
Sponsors = new ObservableCollection <Sponsor>(_sponsorService.GetDownloadedSponsors());
}