Enabling event bubbling for all items in a class

There doesn't seem to be direct way in ExtJS to indicate that all items in a class should bubble events. Below is simple workaround - we iterate over all the items in the class in the 'afterRender' event:

Ext.BLANK_IMAGE_URL = 'lib/ext/resources/images/default/s.gif';

Ext.onReady(function() {
        Ext.QuickTips.init();


        FP = Ext.extend(Ext.form.FormPanel, {
                    frame: true,

                    initComponent: function() {
                        var config = {
                            items: [{
                                        xtype: 'textfield',
                                        name: 'First',
                                        fieldLabel: 'First'
                                    }, {
                                        xtype: 'textfield',
                                        name: 'Second',
                                        fieldLabel: 'Second'
                                    }]
                        };

                        Ext.apply(this, Ext.apply(this.initialConfig, config));
                        FP.superclass.initComponent.apply(this, arguments);

                        this.on('change', function(field, newVal, oldVal) {
                                    console.log('form change event on ' + field.name);
                                }, this);
                    },


                    // When the form has been rendered, we step though all the items on 
                    // the form and enable bubbling for each one. In a more complex form
                    // we would need to check the type of each item and enable the right
                    // kind of events, of course.

                    afterRender: function() {
                        FP.superclass.afterRender.apply(this, arguments);
                        Ext.each(this.items.items, function(item) {
                                    item.enableBubble('change');
                                }, this);
                    }
                });


        var fp = new FP();
        var win = new Ext.Window({
                    items: [fp]
                });
        win.show();
    });