LayoutInflater Custom Class

i have some Problems with LayoutInflater and couldnt find a Solution after many hours.

I try to add a Layout in a Custom Class which extends a SurfaceView. There is no Problem when i add a Layout in the Activity. I read to inflate a Layout in a Custom Class i need the Root View (else i get a null exception). But when i use it nothing apears on the Display. Possible there is something wrong when i inflate with ViewGroup null. I tryed to inflate with root View in the Activity, but same Problem. So i do something wrong but i dont know what :( Pls Help.

Activity Class

public class Aactivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.ui_main);

    LayoutInflater  inflater = LayoutInflater.from(this);       
    FrameLayout     item = (FrameLayout)findViewById(R.id.ui_surface);  
    View            child = inflater.inflate(R.layout.ui_surface, null);
    item.addView(child);

}

}

Surface Class

public class Csurface extends SurfaceView{

public Csurface(Context context, AttributeSet attrs) {
    super(context, attrs);

    LayoutInflater  inflater = LayoutInflater.from(context);
    View            root = inflater.inflate(R.layout.ui_main, null);    
    FrameLayout     item = (FrameLayout)root.findViewById(R.id.ui_option);  
    View            child = inflater.inflate(R.layout.ui_option, null);
    item.addView(child);

}

}

ui_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <FrameLayout
        android:id="@+id/ui_surface"        
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">     
    </FrameLayout>    

    <FrameLayout
        android:id="@+id/ui_option"         
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">     
    </FrameLayout>    

</FrameLayout>

ui_surface.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.development.Csurface
        android:layout_height="match_parent"
        android:layout_width="match_parent"/>     

</RelativeLayout>

ui_option.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://ift.tt/nIICcg"  
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="@string/a_button_01" />

</RelativeLayout>