Ext JS 4.0.1 - Sencha Docs
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New in this version
Ext
Ext.Array
Ext.ComponentQuery
Ext.button.Button
Ext.chart.series.Line
Ext.core.Element
Ext.data.Model
Ext.data.Store
Ext.data.writer.Json
Ext.dd.DragTracker
Ext.form.field.Display
Ext.panel.Panel
Ext.supports
Ext.util.Format
Ext.window.Window
Official Ext JS 4.0 Guides