[android-beginners] embedding listview inside a tabhost

I'm wondering what the correct way is to embed a listview inside a
tabhost?
I've got :
<ListView
     android:id="@+id/list"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"/>

Inside a tabhost but when I try to do anything with it (namely):
        l1 = (ListView) findViewById(R.id.list);
        l1.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, SITES));
It dies with a runtime exception.
Any idea what I might be doing wrong?

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