Hi, i'm using the following view to display a toolbaar with a button in it. But nothing happends when i press the button... I don't even see the button image change from button-up to button-down. Anyone any idea why?

Code:
app.views.test = Ext.extend(Ext.Panel, {
    fullscreen: true,
    
    dockedItems: [
        {
            dock : 'top',
            xtype: 'toolbar',
            title:'Standard Titlebar'
        },
        {
            dock : 'top',
            xtype: 'toolbar',
            ui   : 'light',
            items: [
                {
                    text: 'Test Button',
					handler: function() {
						alert('aaa'); //Not working...
					}
                }
            ]
        }
    ],
    
    html: 'Testing'
});