packages/SystemUI/res/layout-xlarge/status_bar_latest_event.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="65sp"
    android:orientation="vertical"
    android:background="@android:drawable/status_bar_item_background"
    >

    <ImageButton
        android:id="@+id/veto"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_centerVertical="true"
        android:layout_alignParentRight="true"
        android:src="@drawable/status_bar_veto"
        android:scaleType="center"
        android:background="@null"
        android:paddingLeft="16dip"
        android:paddingRight="16dip"
        />

    <com.android.systemui.statusbar.LatestItemView android:id="@+id/content"
        android:layout_alignParentTop="true"
        android:layout_toLeftOf="@id/veto"
        android:layout_width="match_parent"
        android:layout_height="64sp"
        android:focusable="true"
        android:clickable="true"
        android:paddingRight="6sp"
        />

    <View
        android:layout_width="match_parent"
        android:layout_height="1sp"
        android:layout_alignParentBottom="true"
        android:background="@android:drawable/divider_horizontal_dark"
        />

</RelativeLayout>