which view is getting loaded in TabControl

Question

Where should i use this event in my code, as i am a fresher with android

public class Test extends TabActivity
{
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
    super.onCreate(savedInstanceState);
            TabHost host = getTabHost();        
            host.addTab(host.newTabSpec("Test1").setIndicator(new MyView(this, 
            R.drawable.icon, "Test1")).setContent(new Intent(this, Test1.class)));  
            host.addTab(host.newTabSpec("Test2").setIndicator(new MyView(this,  
            R.drawable.compass, "Test2")).setContent(new Intent(this, Test2.class)));
            host.addTab(host.newTabSpec("Test3").setIndicator(new MyView(this,  
            R.drawable.mosquebg, "Test3")).setContent(new Intent(this, 
            Test3.class)));

            host.addTab(host.newTabSpec("Settings").setIndicator(new MyView(this,  
            R.drawable.icon, "Settings")).setContent(new Intent(this, Settings.class)));

            host.getTabWidget().setBackgroundResource(R.drawable.background);


            host.getTabWidget().getChildAt(0).getLayoutParams().height=35;
            host.getTabWidget().getChildAt(1).getLayoutParams().height=35;
            host.getTabWidget().getChildAt(2).getLayoutParams().height=35;
            host.getTabWidget().getChildAt(3).getLayoutParams().height=35;

    }
}