Doesnt work within custom view in actionBar (doesnt fill the whole area)

gistfile1.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="@color/mint"
    >
    <!--<RelativeLayout-->
        <!--android:layout_width="fill_parent"-->
        <!--android:layout_height="fill_parent"-->
        <!--android:background="@color/mint"-->
        <!-->-->

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="hello"/>
    <!--</RelativeLayout>-->

</RelativeLayout>