code: public void setFormValue(Object value) {
  
          if (value == null) {
              value = "";
          }
  
          if (value instanceof String) {
              String strValue = (String)value;
              if (strValue.equals("")) {
                  // interpret empty string as "no radio button selected"
                  reset();
              } else {
                  CmsRadioButton button = m_radioButtons.get(value);
                  m_group.selectButton(button);
              }
          }
      }
docs: Sets the value of the widget.<p>
  
  @param value the new value