TypeError: items is undefined when click image

I'm trying to fire a click event from an image as in the following code, but when the image is clicked, I get an error in Firebug: TypeError: items is undefined

Code:

{
    xtype: 'image',
    listeners: {
        render: function(c) {
            c.getEl().on('click', function(){ this.fireEvent('click', c); }, c);
        }
    },
    height: 80,
    itemId: 'navDashboard',
    width: 85,
    src: './images/atlas/usx2/nav_dashboard_85x80.png'
}