i added these overrides. The store.prefetch() does not fire a 'beforeload' event, but it fires a 'beforeprefetch'. In Ext.LoadMask, onBeforeLoad() shows a mask(potentially), and onLoad() Hides it. I also added the refresh as a StoreListener, which is new in 4.1. I believe refresh is similar to the load event, but it is fired in different situations once the data has arrived.