Tap event question

[AlexandraN]

Hello,

I'm trying to listen to a tap event but I can't get it working. Here's how my app.js file looks like:

var panel = Ext.create('Ext.Panel', {
    style: 'background-color: green;',
    listeners: {
        show: function() {
            alert('hello');
        }
    }
});


panel.addListener({
    body: {
        tap: function() {alert('tap');}
    },
    scope: this
});


//panel.addListener('tap', 
//    function() {alert('tap');},
//    this,
//    {element: 'body'}    
//);


Ext.application({
    name: 'Test App',
    
    launch: function() {        
        Ext.Viewport.add(panel);
    }
});

The 'show' event works, but the 'tap' event doesn't. Could someone please help me?
Thank you!