Strange grey box over transparent listview

Question

Hi,

I have created four tabs that hold four listviews and I have made them transparent and added a background to each list, but now I have a ugly transparent grey box on the middle of the screen, anyone any ideas what this could be andf how I get rid of it.

public void onCreate(Bundle icicle) { super.onCreate(icicle);

    String[] names = new String[] { "Pre"}

ListView lv = getListView();

    lv.setBackgroundResource(R.drawable.pre);

    lv.setTextFilterEnabled(true);

    lv.setCacheColorHint(00000000); 

    lv.setAdapter(new ArrayAdapter<String>(this,

            android.R.layout.simple_list_item_1, names));

}
// Get the item that was clicked
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    if (position == 0) {