private async void ToolbarItem_Clicked(object sender, EventArgs e)
        {
            var editPage = new RemoteDataEditPage();

            editPage.SetData(new ServerDataItem());

            await Navigation.PushAsync(editPage);
        }
        private async void ListViewElementi_ItemTapped(object sender, ItemTappedEventArgs e)
        {
            var item = (ServerDataItem)(e.Item);

            var editPage = new RemoteDataEditPage();

            editPage.SetData(item);

            await Navigation.PushAsync(editPage);
        }