TestRadioGroup = Ext.extend ( Ext.form.RadioGroup, {
        fieldLabel: 'Test',
        listeners: {
            change: function(el,val) {
                alert(val);
            }
        },
        constructor: function(config) {
            this.items = [];
            this.items.push ( {boxLabel: 'Test1', name: 'test', inputValue: 2 } );
            this.items.push ( {boxLabel: 'Test2', name: 'test', inputValue: 1 } );
            this.items.push ( {boxLabel: 'Test',name: 'test', inputValue: 0  }  );
           current_value = Cookie.get('test_current_value');
            TestRadioGroup.superclass.constructor.call(this);
        }
});

// call with name and value
myCheckboxGroup.setValue('cb-col-1', true);
// call with an array of boolean values
myCheckboxGroup.setValue([true, false, false]);
// call with an object literal specifying item:value pairs
myCheckboxGroup.setValue({
    'cb-col-2': false,
    'cb-col-3': true
});
// use comma separated string to set items with name to true (checked)
myCheckboxGroup.setValue('cb-col-1,cb-col-3');