code: public void setChecked(boolean checked) {
  
          m_button.setDown(checked);
          if (checked) {
              m_group.selectButton(this);
          } else {
              m_group.deselectButton();
          }
      }
docs: Sets the 'checked' status of the radio button.<p>
  
  @param checked if true, check the radio button, else uncheck it