Unable to get reference of the items in the Custom ActionBar

问题

I am using a RelativeLayout with some items like EditTexts, Buttons to set a Custom ActionBar view. The problem is that I am unable to get the references of the items which are there in that custom view.

Here is the custom view for ActionBar

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@color/actionbar_background"
android:gravity="fill_horizontal|center_horizontal" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:gravity="center_horizontal"
        android:paddingTop="10dp" >

        <ImageButton
            android:id="@+id/ab_home"
            android:layout_width="47dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:paddingLeft="6dp"
            android:paddingRight="6dp"
            android:src="@drawable/home" />
    </LinearLayout>

    <View
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:alpha="0.2"
        android:background="@color/left_menu_background" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="6"
        android:orientation="horizontal" >

        <LinearLayout
            android:id="@+id/ab_action_search"
            android:layout_width="match_parent"
            android:padding="7dp"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:visibility="gone" >

            <EditText
                android:id="@+id/et_search"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@drawable/rounded_edittext"
                android:drawablePadding="8dp"
                android:drawableRight="@drawable/action_search_light"
                android:hint="Search"
                android:imeOptions="actionSearch"
                android:paddingLeft="5dp"
                android:singleLine="true"
                android:cursorVisible="false"
                android:textColor="#000000"
                android:textSize="15dp" />

        </LinearLayout>

        <LinearLayout
            android:id="@+id/ab_action_buttons"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:paddingTop="10dp"
            android:visibility="visible" >

            <Button
                android:id="@+id/btn_customAB_font"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@null"
                android:text="@string/icon_font"
                android:textColor="#FFFFFF"
                android:textSize="10dp" />

            <Button
                android:id="@+id/btn_customAB_tasks"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@null"
                android:text=""
                android:textColor="#FFFFFF"
                android:textSize="25dp" />

            <Button
                android:id="@+id/btn_customAB_search"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@null"
                android:clickable="true"
                android:text="@string/icon_search"
                android:textColor="#FFFFFF"
                android:textSize="25dp" />
        </LinearLayout>
    </LinearLayout>

    <View
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:alpha="0.2"
        android:background="@color/left_menu_background" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:paddingTop="10dp" >

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:src="@drawable/ic_action_user" />
    </LinearLayout>
</LinearLayout>

</RelativeLayout>

Here is how I inflate and setCustomView of the ActionBar.

ActionBar ab = getSupportActionBar();

    ab.setDisplayShowCustomEnabled(true);
    ab.setDisplayHomeAsUpEnabled(false);
    ab.setDisplayShowHomeEnabled(false);
    ab.setDisplayUseLogoEnabled(false);
    ab.setCustomView(R.layout.custom_actionbar);

inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
customActionBarView = inflater.inflate(R.layout.custom_actionbar,null);
ImageButton ib = (ImageButton) customActionBarView.findViewById(R.id.ab_home); 

ib.setOnClickListener(new OnClickListener() {
    @Override
        public void onClick(View v) {
        Log.d(TAG, "Home Clicked");
        }
    });

This log statement is never run. I Think I am using the findViewById() in a wrong way to reference the Buttons.

Any help would greatly appreciated.