Ext JS 4.0.6 - Sencha Docs
Base
Support
Application Architecture
Components
Components
Tree
Toolbar
Menu
Charts
Drag & Drop
Component Utilities
Data
Data Models
Data Readers & Writers
New in this version
New classes
Ext.Element
Ext.app.Controller
Ext.button.Button
Ext.chart.series.Cartesian
Ext.chart.series.Scatter
Ext.container.Viewport
Ext.data.NodeInterface
Ext.data.validations
Ext.form.field.ComboBox
Ext.form.field.Display
Ext.grid.column.Action
Ext.layout.container.Fit
Ext.panel.Table
Ext.selection.RowModel
Ext.state.Stateful
Ext.tab.Tab
Official Ext JS 4.0 Guides