title: Fire 'tel' link from button in Sencha Touch
body: <p>I have an ActionSheet which is shown when a user taps on a list item. In the ActionSheet are three buttons - one to remove the contact, one to make a call to them and one to dismiss the ActionSheet. My question is, how do I bind the equivalent of a <code>&lt;a href="tel:000000000"&gt;&lt;/a&gt;</code> to the button? </p>
  
  <p>I need to specify the 'tel:' protocol so that iOS and Android will force the Phone application to load with this number?</p>