Help - Binding Radio Group

[srilekhamca@gmail.com]

Radio group auto binding is not working properly i am getting an error as com.extjs.gxt.ui.client.widget.form.Radio. So i did a manual binding as below

private RadioGroup vipRadioGroup;
this.formBinding.addFieldBinding( new FieldBinding( vipRadioGroup, "vip" ) );


Even then i get the same error. Has anyone tried using RadioGroup, if so could you please send me the code and the solution for this problem. Thanks.