title: how to put a button at the bottom of the listbox in wp7?
body: <p>Windows phone 7.5 and above.</p>
  
  <p>I wanna add a button at the bottom of the list, so the user can click it to fetch more articles.</p>
  
  <p>I put a button inside a listbox in xaml. But it does not work, when the itemsource of the listbox get binded at the runtime, the button disappear.</p>
  
  <p>how to approach the goal?</p>