Android : how to create optionmenu for android 3.0 and higher version

How to create optionmenu for android 3.0 and higher version mobiles. I am trying to create options menu in my Android program. I am using the following code to inflate options menu :

public class MainScreenTab extends FragmentActivity implements
ActionBar.TabListener {

private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;

private String[] tabs = { "Merchants", "Personal Payee" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_screen_tab_layout);

        //Initilization
        viewPager = (ViewPager) findViewById(R.id.pager);
        actionBar = getActionBar();
        mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

        viewPager.setAdapter(mAdapter);
        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        //Adding Tabs
        for (String tab_name : tabs) {
            actionBar.addTab(actionBar.newTab().setText(tab_name)
            .setTabListener(this));
        }

        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // on changing the page
                // make respected tab selected
                actionBar.setSelectedNavigationItem(position);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });


    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu); //inflate our menu
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        // switch(item.getItemId()) {
        int id = item.getItemId();

        if (id == R.id.item_refresh) {
            Intent i = new Intent(MainScreenTab.this,ListMerchantType.class);
            startActivity(i);
            return true;
        }
        else if (id == R.id.item_save) {
            Intent i = new Intent(MainScreenTab.this,ListPayee.class);
            startActivity(i);
            return true;
        }

             return super.onOptionsItemSelected(item);
    }

}

Thanks in advance,

Deepak D