javascript - ExtJs 4.1.1 Checkbox is rendering as button, need normal check box -

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i using extjs 4.1.1 , want render normal checkbox rendered in div, following code rendered button. checked extjs source ext.form.field.checkbox , in found comment fieldsubtpl property says 

// creates not actual checkbox, button given aria role="checkbox" (if aria required) , // styled custom checkbox image. allows greater control , consistency in // styling, , using button allows gain focus , handle keyboard nav properly.

if case way normal checkbox? 

 ext.create('ext.container.container',{             id: 'mycontainer',             width: 100,             renderto: 'chekboxid',              items: [{                  xtype:'checkboxgroup',                  id:'chekcboxgrpid',                  items:[                     {                           boxlabel: 'text check box',                                           name : 'mycheckbox',                      inputvalue: 'true',                      checked: true                      }                   ]              }]         })

i think problem haven't include css/images project here example

css

<link rel="stylesheet" href="http://cdn.sencha.io/try/extjs/4.1.1/resources/css/ext-all-gray.css">

html

    <div id="checkbox"></div>

javascript

ext.onready(function(){     var panel = ext.create('ext.panel.panel', {         items: {             xtype: 'fieldcontainer',             fieldlabel: 'toppings',             defaulttype: 'checkbox',             items: [                 {                     boxlabel  : 'anchovies',                     name      : 'topping',                     inputvalue: '1',                     id        : 'checkbox1'                 }             ]         }     });     panel.render('checkbox'); })

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