Android : Customize dialog title bar

i have coded a custom dialog class.in here i want to change the title.so i coded a layout and using LayoutInflater set it to setFeatureInt method as parameter.but once i run it run-time errors occurred. v.getid always return -1.how to solve this error.if i remove v.getid and put R.layout.titleview it works finely.

public class CusAlertDialog {

    private Button btn_ok, btn_cancel;
    private TextView textmsg;
    private Dialog dialog;
    private Context context;

    public CusAlertDialog(Context context) {

        this.context = context;
        dialog = new Dialog(context);
         dialog.requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
        dialog.setContentView(R.layout.mydialoglayout);

         setBtn_ok((Button) dialog.findViewById(R.id.btn_ok));
         setBtn_cancel((Button) dialog.findViewById(R.id.btn_cancel));
         textmsg = (TextView) dialog.findViewById(R.id.textmsg);

         /////////////////////////////////////////////////////////////


         LayoutInflater myLayout = LayoutInflater.from(context);
            View v = myLayout.inflate(R.layout.titleview, null);
            TextView title = (TextView) v.findViewById(R.id.title);
              title.setText("lahiru");
            v.getId();
            CustomLog.d("inflator", myLayout+"");
            CustomLog.d("view", v.getId()+"");//this return -1

          dialog.getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, v.getId()); 

        // TODO Auto-generated constructor stub
    }

    public void setMessage(CharSequence massage) {
        textmsg.setText(massage);
    }

    public void setPositiveButtonName(CharSequence massage)
    {
        btn_ok.setText(massage);
    }

    public void setNegitiveButtonName(CharSequence massage)
    {
        btn_cancel.setText(massage);
    }

    public void show() {
        dialog.show();
    }

    public Button getBtn_ok() {
        return btn_ok;
    }

    public void setBtn_ok(Button btn_ok) {
        this.btn_ok = btn_ok;
    }

    public Button getBtn_cancel() {
        return btn_cancel;
    }

    public void setBtn_cancel(Button btn_cancel) {
        this.btn_cancel = btn_cancel;
    }

    public void dismiss()
    {
        dialog.dismiss();
    }
}

titleview xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00000000" >

<TextView
        android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dp"
            android:textSize="25dp"
            android:textStyle="bold"
            android:maxLines="1"
            android:ellipsize="end"
            android:text="yeay"
             />
</RelativeLayout>