Disable device back button click in OpenUI5?

How can i disable android device back button click event in Phonegap Openui5 application? Tried this but didn't work.

document.addEventListener("deviceready", onDeviceReady, false);
  function onDeviceReady() {
  document.addEventListener("backbutton", function (e) {
  e.preventDefault();
  }, false );
}

Is there anyway i can catch hold of device back button event?