Android - How to move ActionBar.Tab's icon as your needs (example using ActionBarSherlock)

PropositionListActivity.java

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.SherlockActivity;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.ImageView;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.NavUtils;

public class PropositionListActivity extends SherlockActivity implements ActionBar.TabListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); 
        
        setContentView(R.layout.proposition_list);
        
        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        
        createTab(R.layout.tab_to_opine, R.id.tab_to_opine_title, "Vou Opinar");
        createTab(R.layout.tab_opined, R.id.tab_opined_title, "Já Opinei");
        createTab(R.layout.tab_feedback, R.id.tab_feedback_title, "Feedback");
    }
    
    public void createTab(int view, int titleView, String title) {
    	ActionBar.Tab tab = getSupportActionBar().newTab();
        tab.setTabListener(this);
        tab.setCustomView(view);
        getSupportActionBar().addTab(tab);
        
        ((TextView) findViewById(titleView)).setText(title);
    }
}

tab_to_opine.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/tab_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/tab_to_opine"
        android:background="@android:color/transparent" />

    <TextView
        android:id="@+id/tab_to_opine_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>