extjs: TextField/Field 100% width

new Ext.FormPanel({
   labelWidth: 75,
   autoWidth: true,
   items: [{
           xtype: 'textfield',
           fieldLabel:'Name',
           anchor:'100%'
       }]
}

Note:

1. The container component set autoWidth to true

2. The TextField item set the anchor value

  anchor : 'width height'
     exemple:
        anchor:'100% 98%'
      or
        anchor:'-29 -10'//(bodycontentwidth - 29, bodycontentheight - 10)