title: Is it possible to add title to charts?
body: <p>I want to add a title to a chart, like in the <a href="http://dev.sencha.com/deploy/ext-4.0.2a/examples/charts/Gauge.html" rel="noreferrer">gauge example</a> or a pie chart. I want to display a title under or on top of the chart. Is this possible? I've been looking and can't find anything about this. if so , any tip to share?
  it would be something like this <img src="https://i.stack.imgur.com/NlZih.png" alt=" gauge with titles" /></p>
  <p><em><strong>EDIT</strong></em>: i found there is a property to create <strong>text sprites</strong> for the title or any labels at the <strong>Ex.draw package</strong>.
  but i couldnt understand how to use it..</p>
  <p>anybdy here have done the same?</p>