code: public void setSelected(final boolean selected) {
  		if (selected) {
  			if (isDisabled()) {
  				throw new IllegalStateException("Cannot select a disabled radio button");
  			}
  			getGroup().setSelectedValue(getValue());
  		} else if (isSelected()) {
  			// Clear selection
  			getGroup().setData(null);
  		}
  	}
docs: Sets whether the radio button is selected.
  
  @param selected true if the button should be selected, false if not