why can not find the default android Resource :Android.Resource.Layout.SimpleListItem1

I want to show some data user ListView in mono for android.

I have created a ListActivity extends Activity

public class MainActivity : ListActivity { ... }

But I can not find the default android Resource :Android.Resource.Layout.SimpleListItem1.

The inferences drawn from data,

docs.xamarin.com/guides/android/user_interface/working_with_listviews_and_adapters/part_2_-_populating_a_listview_with_data/

android have many default Item for listview.Such as SimpleListItem1,SimpleListItem2,SimpleListChecked ..

I want to know why ，how should ido