cc.Menu.extend error

When I extend cc.Menu class like this:var MainMenu = cc.Menu.extend({ ……….
but it not works at js-binding, the error is: TypeError: cc.Menu.extend is not a function , why, can somebody meet the same problem?

You could add `cc.Menu.extend = cc.Class.extend;` in jsb_cocos2d.js

James Chen wrote:

You could add `cc.Menu.extend = cc.Class.extend;` in jsb_cocos2d.js

OK, I try it, Thanks very much!