The source code

    /*!
     * Ext JS Library 3.3.1
     * Copyright(c) 2006-2010 Sencha Inc.
     * licensing@sencha.com
     * http://www.sencha.com/license
     */
    Ext.ux.PortalColumn = Ext.extend(Ext.Container, {
        layout : 'anchor',
        //autoEl : 'div',//already defined by Ext.Component
        defaultType : 'portlet',
        cls : 'x-portal-column'
    });

    Ext.reg('portalcolumn', Ext.ux.PortalColumn);