Android : GestureOverlayvew over Google map Vew

I was just curious that I am trying to add gestureoverlayview over google mapview. Gesture works properly but map cannot be seen

my fragment layout file is

`<?xml version="1.0" encoding="utf-8"?>
<android.gesture.GestureOverlayView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gestures"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:background="@null"
    android:gestureStrokeType="multiple"
    android:eventsInterceptionEnabled="true"
    android:orientation="vertical">



     <LinearLayout
                android:id="@+id/map_holder"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical" >
</LinearLayout>

</android.gesture.GestureOverlayView>

I added map programatcally. which is

 FragmentManager fm = getChildFragmentManager();
            fragment = (SupportMapFragment) fm.findFragmentById(R.id.map_holder);
            if (fragment == null) {
                fragment = SupportMapFragment.newInstance();
                fm.beginTransaction().replace(R.id.map_holder, fragment).commit();
            } 
            `

Can anyone suggest me 1)how do it correctly and also 2) how to pass touch to map so that I can move map to a certain location and apply gesture there!!