dynamically creating entry in drop down box using dojo

开发者_C百科 Merged with how do dynamically create new option of drop down box using dojo.

Js code

var ref =dojo.byId("xyz");
var optn = document.createElement("OPTION");
optn.text="txt"
optn.value="val"
ref.options.add(optn);

I want dojo equivalent of above code