code: function (eventType, handler) {
  		// simplest possible event model for internal use
  		this.element['on' + eventType] = function () {
  			var evt = win.event;
  			evt.target = evt.srcElement;
  			handler(evt);
  		};
  		return this;
  	}
docs: Add an event listener. VML override for normalizing event parameters.
  @param {String} eventType
  @param {Function} handler