public ContactsList()
        {
            InitializeComponent();

            vm             = new VMContactsList(Acr.UserDialogs.UserDialogs.Instance, Navigation);
            BindingContext = vm;
        }
        protected override void OnAppearing()
        {
            if (vm == null)
            {
                vm = BindingContext as VMContactsList;
                vm.IniciaGPS();
            }
            if (vm != null)
            {
                vm.Reload();
            }

            base.OnAppearing();
        }