ext扩展控件------向导控件（上一步，下一步，返回）

The component consists of three classes: Ext.ux.Wiz (deriving from Ext.Window): The base class for a wizard component. A window that holds paging-buttons (previous/next step) and a button for canceling the wizard. Flexible event-listener behavior guarantees complex wizard workflows. Paging-buttons will be enabled/disabled based on the validator-rules found in the current active card (type: Ext.ux.Wiz.Card). Ext.ux.Wiz.Header (deriving from Ext.BoxComponent): A component that can be used as a header/footer/whatever to indicate the progress in the wizard. Also shows information about the wizard��s purpose, as configured. Ext.ux.Wiz.Card (deriving from Ext.FormPanel): Each card represents a step in the setup-process and holds either form-elements which are validated automatically (monitorValid:true) or plain informations about the progress in the wizard so far, or both. An array of instances of Ext.ux.Wiz.Card will be passed to Ext.ux.Wiz to automatically build and layout the wizard.