title: how do dynamically create new option of drop down box using dojo
body: <p>JavaScript code:</p>
  
  <pre><code>var ref =dojo.byId("xyz");
  var optn = document.createElement("OPTION");
  optn.text="txt"
  optn.value="val"
  ref.options.add(optn);
  </code></pre>
  
  <p>I want dojo equivalent of above code</p>