MODX Revolution remember ExtJS tab state

/*
In your tab panel definition (you know, the object with "xtype: 'modx-tabs'" in it) add the following lines to have the active tab remembered:

Tested on MODX Revolution 2.1.5-pl
*/

// Copied from modx.layout.js
,activeTab: 0
,stateful: true
,stateId: 'modx-ima_graph-state'
,stateEvents: ['tabchange']
,getState:function() {
    return {
        activeTab:this.items.indexOf(this.getActiveTab())
    };
}
// End copied from modx.layout.js