Blah.js

Ext.define( 'CallList.view.Blah', {

    extend: 'Ext.Container',

    alias: 'widget.blah',

    config: {
        title: 'Blah',
        iconCls: 'trash',

        styleHtmlContent: true,
        scrollable: true,

        items: [
            {
                docked: 'top',
                xtype: 'titlebar',
                title: 'Blah'
            },
            {
                xtype: 'button',
                text: 'Notification',
                handler: function() {
                    alert( navigator );
                    alert( navigator.notification );
                }
            }
        ]
    }

});