Ext JS 4.1 Plugin to add items to the right side of a panel header

PanelHeaderExtraIcons.js

Ext.define('Ext.ux.panel.header.ExtraIcons', {
	extend: 'Ext.AbstractPlugin',
	alias: 'plugin.headericons',
	alternateClassName: 'Ext.ux.PanelHeaderExtraIcons',

	iconCls: '',
	index: undefined,

	headerButtons: [],

	init: function(panel) {
		this.panel = panel;
		this.callParent();
		panel.on('render', this.onAddIcons, this, {single: true});
	},

	onAddIcons :function () {
		if (this.panel.getHeader) {
			this.header = this.panel.getHeader();
		} else if (this.panel.getOwnerHeaderCt) {
			this.header = this.panel.getOwnerHeaderCt();
		}
		this.header.insert(this.index || this.header.items.length, this.headerButtons);
	}
});