Define column model and set header, dataIndex and sortable
<html> <head> <title>Hello World Window</title> <link rel="stylesheet" type="text/css" href="ext-3.0.0/resources/css/ext-all.css" /> <script type="text/javascript" src="ext-3.0.0/adapter/ext/ext-base.js"></script> <script type="text/javascript" src="ext-3.0.0/ext-all.js"></script> </head> <script type="text/javascript"> Ext.onReady(function() { var arrayData = [ ['J', 'MD'], ['A', 'VA'], ['S', 'DC'], ['M', 'DE'], ['B', 'NJ'], ['N', 'CA'] ]; var store = new Ext.data.ArrayStore({ data : arrayData, fields : ['fullName', 'state'] }); var cm = new Ext.grid.ColumnModel([ { header : 'Full Name', sortable : true, dataIndex : 'fullName' }, { header : 'State', dataIndex : 'state' } ]); var gridView = new Ext.grid.GridView(); var selModel = new Ext.grid.RowSelectionModel({ singleSelect : true }) var grid = new Ext.grid.GridPanel({ title : 'Our first grid', renderTo : Ext.getBody(), autoHeight : true, width : 250, store : store, view : gridView, colModel : cm, selModel : selModel }); }); </script> <body> </body> </html>