title: Dojo : how to set to disable new button
body: <p>Hi I have trouble setting the new button to disabled. 
  I am using Dojo 1.8</p>
  
  <p>See my code below:-</p>
  
  <pre class="lang-javascript prettyprint-override"><code>require(["dojo/parser", "dijit/layout/BorderContainer",
  "dijit/form/Button","dojo/on","dijit/form/Select",
  "dojo/store/Memory", "dojo/request","dojo/domReady!"
  ],
  function(parser, BorderContainer, Button, on, Select, Memory, request)
  {
  
  var btn4 = new Button // Button, not button
  ({
      label: "Number of cards",
      this.set("disabled", false) // This code that disables the button
      },"btn4"); 
  btn4.startup();
  })
  </code></pre>
  
  <p>I cannot find help in Dojo or google for it.</p>