rb0.addValueChangeHandler(rb0MockChangeHandler);
RadioButton rb1 = new RadioButton("myRadioGroup", "bar");
RootPanel.get().add(rb1);
MockValueChangeHandler<Boolean> rb1MockChangeHandler = new MockValueChangeHandler<Boolean>();
rb1.addValueChangeHandler(rb1MockChangeHandler);
RadioButton rb2 = new RadioButton("myRadioGroup", "baz");
RootPanel.get().add(rb2);
MockValueChangeHandler<Boolean> rb2MockChangeHandler = new MockValueChangeHandler<Boolean>();
rb2.addValueChangeHandler(rb2MockChangeHandler);