ExtJS load radiogroup values

extjs_load_radio.js

new Ext.form.FormPanel({
  items: [{
      xtype: "radiogroup"
      ,fieldLabel: "Gender"
      ,allowBlank: false
      ,items: [{
          boxLabel: "Yes"
          ,name: "person-gender_rb"
          ,id: "person-gender_rb-true"
          ,inputValue: "true"
        },{
          boxLabel: "No"
          ,name: "person-gender_rb"
          ,id: "person-gender_rb-false"
          ,inputValue: "false"
        }
      ]
    }
  ]
  ,listeners: {
    afterLayout: function() {
      this.load({
        url: "/data.json"
        ,method: "GET"
        ,params: {
          response_format: "extjs_form_load"
        }
        ,success: function(form, action) {
          // This is what selects the correct option in the radio group
          for(item in action.result.data) {
            if(item.match(/_rb$/)) {
              Ext.getCmp(item + "-" + action.result.data[item]).setValue(true);
            }
          }
        }
      });
    }
  }
});