title: ListView full button disappears
body: <p>I have a listview and a button in a layout file which looks fine, however if the listView fills the screen the button goes missing, can someone advise me please.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical" &gt;
  
  &lt;ListView
   android:id="@+id/myListView"
   android:layout_width = "fill_parent"
   android:layout_height = "wrap_content"/&gt;
  
   &lt;Button 
      android:id="@+id/back_button"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_margin="20dip"
      android:text="@string/backButton_label" /&gt;
  
   &lt;/LinearLayout&gt;
  </code></pre>