Checkbox cb1, cb2, cb3; //independent checkboxes
        CheckboxGroup cbg;

        //Build panel, which contains a checkbox group
        cbg = new CheckboxGroup();
        cb1 = new Checkbox("Medium Wave", cbg, false);
        cb2 = new Checkbox("VHF", cbg, false);
        cb3 = new Checkbox("Long Wave", cbg, false);