title: getSupportActionBar() of SherlockActivity returns null
body: <p>I am trying to use <code>Sherlock ActionBar</code> by extending my <code>Activity</code> to <code>Sherlock Activity</code> but I am receiving the following error on <code>getSupportActionBar()</code> which return <code>null</code>.</p>
  
  <pre><code>05-16 10:45:22.537: E/AndroidRuntime(20631): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tzoomers.birthdaysdiary/com.tzoomers.birthdaysdiary.SyncActivity}: java.lang.NullPointerException
  05-16 10:45:22.537: E/AndroidRuntime(20631):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2194)
  05-16 10:45:22.537: E/AndroidRuntime(20631):    at android.app.ActivityThread.startActivityNow(ActivityThread.java:1991)
  05-16 10:45:22.537: E/AndroidRuntime(20631):    at 
  .
  .
  ..
  
  05-16 10:45:22.537: E/AndroidRuntime(20631): Caused by: java.lang.NullPointerException
  05-16 10:45:22.537: E/AndroidRuntime(20631):    at com.tzoomers.birthdaysdiary.SyncActivity.onCreate(SyncActivity.java:38)
  05-16 10:45:22.537: E/AndroidRuntime(20631):    at android.app.Activity.performCreate(Activity.java:4531)
  05-16 10:45:22.537: E/AndroidRuntime(20631):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
  </code></pre>
  
  <p>I am setting the <code>App Theme</code> to <code>android:theme="@style/Theme.Sherlock.Light.DarkActionBar"</code>. Can anyone please tell me why i am getting <code>NullPointerException</code> on <code>getSupportActionBar()</code> in <code>SherlockActivity</code>?</p>
  
  <p>Activity is :</p>
  
  <pre><code>package com.tzoomers.birthdaysdiary;
  
  import com.actionbarsherlock.app.SherlockActivity;
  import com.tzoomers.controller.BirthdaysClickOListener;
  import android.os.Bundle;
  import android.widget.Button;
  
  public class SyncActivity extends SherlockActivity{
      Button importFromFacebookButton, sendToDeviceButton, receiveFromDeviceButton, saveToSdCardButton, loadFromSDCardButton;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          // TODO Auto-generated method stub
          super.onCreate(savedInstanceState);
          setContentView(R.layout.layout_sync_activity);
  
  //      requestWindowFeature(Window.FEATURE_ACTION_BAR);
  
          importFromFacebookButton  = (Button) findViewById(R.id.importFacebookButton);
          sendToDeviceButton  = (Button) findViewById(R.id.sendToDeviceButton);
          receiveFromDeviceButton  = (Button) findViewById(R.id.receiveFromDeviceButton);
  
          importFromFacebookButton.setOnClickListener(
                  new BirthdaysClickOListener(ActionType.IMPORT_FACEBOOK_CONTACTS, this));
          sendToDeviceButton.setOnClickListener(
                  new BirthdaysClickOListener(ActionType.SEND_TO_DEVICE, this));
          receiveFromDeviceButton.setOnClickListener(
                  new BirthdaysClickOListener(ActionType.RECEIVE_FROM_DEVICE, this));
  
  //      getActionBar().setDisplayHomeAsUpEnabled(true);
  //      getSupportActionBar().se
          getSupportActionBar().setDisplayHomeAsUpEnabled(false);
      }
  
      @Override
      public boolean onOptionsItemSelected(
              com.actionbarsherlock.view.MenuItem item) {
          // TODO Auto-generated method stub
          return super.onOptionsItemSelected(item);
      }
  
      public enum ActionType
      {
          IMPORT_FACEBOOK_CONTACTS, SEND_TO_DEVICE, RECEIVE_FROM_DEVICE, SAVE_TO_SDCARD, LOAD_FROM_SDCARD
      }
  }
  </code></pre>
  
  <p>Thanks in advance.</p>
  
  <p>Regards,</p>