android:layout_weight with vertical linearlayout
===

I'm trying to create a android layout like:

[####EditText###][Button]

[####listview#####]

For that i'm using weight, but the following xml is giving me something very strang like:

[editText][button][ListView]

Someone know why?

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:background="@drawable/background"
        android:weightSum="10"
         >
        
        <EditText android:id="@+id/nova_lista"
            android:inputType="text"
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:layout_weight="9"
            android:hint="@string/new_list_hint">
            
        </EditText>
        
        <Button android:id="@+id/nova_lista_botao"
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="@string/new_list"/>
    
        <ListView
            android:id="@+id/list_of_lists"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >
        </ListView>
    
    </LinearLayout>