title: Different layers in Corona/Lua
body: <p>I've got a question about layering images/buttons with Corona/Lua. If I create one button on top of another one and then click it, both buttons' events are triggered. How do I prevent this?</p>
  
  <p>Thanks, Elliot Bonneville</p>
  
  <p>EDIT: Here's how I create the buttons:</p>
  
  <pre><code>button1 = display.newImage("button1.png")
  button1:addEventListener("tap", Button1Call)
  
  button2 = display.newImage("button2.png")
  button2:addEventListener("tap", Button2Call)
  </code></pre>