Add Prefrences Screen to an Activity with a customized window title

问题

I know its possible to add a button to a prefernces Screeen activtiy. I read this question How to add a button to PreferenceScreen and it works perfect. But if I want to add my custom title my application just crashes. The customtitle works perfect in its own activity and the preference screen with button works also perfect in its own activity. So my problem is only based on bringing these two functions together.

heres my code in of the java file

public class TestHeadlineActivity extends PreferenceActivity implements OnClickListener{
   /** Called when the activity is first created. */
Button settingsButton;
TextView tv_WindowTitleAccuracy;

    @Override
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
       addPreferencesFromResource(R.xml.prefs);
       setContentView(R.layout.main);
       getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);
       settingsButton = (Button) findViewById(R.id.Button_Settings);
       settingsButton.setText("BUTTONTEXT");
   settingsButton.setOnClickListener(this);
   tv_WindowTitleAccuracy = (TextView) findViewById(R.id.tv_WindowTitleAccuracy);
   tv_WindowTitleAccuracy.setText("TEXT");

   }

 @Override
 public void onClick(View v) {

     finish();

       }
      }

this is my main xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
           android:layout_width="fill_parent"
           android:layout_height="fill_parent"
           android:orientation="vertical">
<ListView android:id="@android:id/list"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent" android:layout_weight="10"/>
<Button android:text="This is a button on top of all preferences."
          android:layout_height="wrap_content" 
          android:layout_weight="1" android:layout_width="fill_parent"/>
</LinearLayout>

and heres my prefs

 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

 <EditTextPreference
    android:title="EditText"
    android:key="name"
    android:summary="Enter your name"
    ></EditTextPreference>

  <CheckBoxPreference 
    android:title="Music"
    android:defaultValue="true"
    android:key="checkbox"
    android:summary="for the splash screen"
     />
  </PreferenceScreen>

thanks guys