Demo of using Ext.override and Ext.define with override processor
<iframe src="http://player.vimeo.com/video/56729389?autoplay=1" width="500" height="448" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>Sencha Eclipse Plugin - Ext.override / Ext.define override support from Justin Early on Vimeo.
Demo 1 of using Ext.override