Where should view events live if not using ExtJS MVC architecture?

HTML

<link rel="stylesheet" href="//extjs.cachefly.net/ext-4.1.0-gpl/resources/css/ext-all-gray-debug.css" />
<script src="//extjs.cachefly.net/ext-4.1.0-gpl/ext-all-dev.js"></script>

JavaScript

var dh = Ext.DomHelper;

var list = dh.append(Ext.getBody(), {
    tag : 'div',
    style : "position:absolute;top:100px;left:10px;"
});

var b = Ext.create("Ext.Button", {
text:"hey",
    listeners : {
        click : function(){
            this.setText("By");
        }
    },
renderTo: list});