YUI 3以编程方式触发更改事件

我想知道如何用yui3以编程方式触发一个变更事件——我向一个选择框节点添加了一个变更监听器:

Y.get('#mynode').on('change', function(e) {
 Alert(“changed me”);
});

脚本中的其他地方想触发该事件。当然,当用户更改浏览器中的“选择框”值时,它会起作用。但我已经尝试了很多方法以编程的方式来启动它,但都没有奏效。包括:

// All below give this error: T[X] is not a function (referring to what's called in .invoke(), // in the minified javascript
Y.get('#mynode').invoke('onchange');
Y.get('#mynode').invoke('change');
Y.get('#mynode').invoke('on','change');
Y.get('#mynode').invoke("on('change')");


/* Tried using .fire() which I found here: 
* http://developer.yahoo.com/yui/3/api/EventTarget.html#method_fire
* Nothing happens
*/

Y.get('#mynode').fire('change'); 

/* Looking around the APIs some more, I found node-event-simulate.js: 
 * http://developer.yahoo.com/yui/3/api/node-event-simulate.js.html, 
 * which by its name would seem to have what I want. I tried:
 * Error: simulate(): Event 'change' can't be simulated. 
 * ( (function(){var I={},B=new Date().getTim...if(B.isObject(G)){if(B.isArray(G)){E=1;\n)
 */

Y.get('#mynode').simulate('change');

任何帮助都将不胜感激!