[android help] GetSupportActionBar return null

After I started my second Activity, there isn't the ActionBar. When I call GetSupportActivity, it returns null. Why? I have minSdkVersion 10 and targetSdkVersion 15.

    package="com.test.myapp"
    android:versionCode="1"
    android:versionName="1.0" >

            android:minSdkVersion="10"
        android:targetSdkVersion="15"
        />
    
    

            android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/Theme.Sherlock.Light" 
        >
                    android:name=".MainActivity"
            android:label="@string/title_activity_main" 
            android:windowSoftInputMode="stateHidden"
            >
            
                

                
            
        
                    android:name=".ShowMusic2"
            android:label="Search Results">
            
                
            
        
    

This is the OnCreate of my second activity (ShowMusic2). It is a ListActivity.

public class ShowMusic2 extends SherlockListActivity {
        @Override
        public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        showMusic = getIntent();
        pkgName = getPackageName();
        html = (String)showMusic.getStringExtra(pkgName + ".html");     
        new populateListView().execute(songs.toArray(new Song[songs.size()]));
        adapter =new SongAdapter(this,R.layout.list_item1, songs.toArray(new Song[songs.size()]));
        setListAdapter(adapter);
    }

.

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