We need to know all events that are fired by a component and in which order sometimes. It is easy to find out. Let’s say that the component in question has id my-comp. Load the page with the component, open Firebug, Console tab, and type:

Ext.util.Observable.capture(Ext.getCmp('my-comp'), console.info)

Now do some actions with the component and watch the Firebug output.