title: How to measure the size of the button's label in Corona SDK
body: <p>I need to make a button with a dynamic width, based on its label.</p>
  
  <p>So, I though in measuring the size of the label of the button but, the problem is that I cannot find nowhere how to do that without creating a <code>display.newText</code> of the label.</p>
  
  <p>How can I do that? Is there any other way to dynamically set the button width based on its label?</p>