Selection of the specified row during grid initialization in extjs

<LINK rel = "stylesheet" type = "text/CSS" href = "extjs/resources/CSS/ext-all.css"/> <SCRIPT type = "text/JavaScript" src = "extjs /adapter/EXT/ext-base.js "> </SCRIPT> <SCRIPT type =" text/JavaScript "src =" extjs/ext-all.js "> </SCRIPT> <SCRIPT> var aData = [['11 ', '12'], ['21', '22'], ['31', '32'], ['41', '42']; Ext. onready (function () {var orecord = ext. data. record. create ([{Name: 'f1', type: 'string'}, {Name: 'F2', type: 'string'}]); var store = new Ext. data. store ({Proxy: New Ext. data. memoryproxy (aData), Reader: New Ext. data. arrayreader ({}, orecord)}); store. load (); var Sm = new Ext. grid. checkboxselectionmodel ({singleselect: false}); var columns = new Ext. grid. columnmodel ([New Ext. grid. rownumberer (), Sm, {header: 'field 1', dataindex: 'f1'}, {header: 'field 2', dataindex: 'F2'}]); grid = new Ext. grid. gridpanel ({Title: 'LIST', autoheight: True, Region: 'center', loadmask: True, store: store, CM: columns, SM: Sm, renderto: 'pad '}); setTimeout (function () {grid. selmodel. selectrows ([0, 2]) ;}, 300) ;}); </SCRIPT> <Div id = 'pad'> </div>