code: public JToggleButton getSelectedToggleButton() {
          for (final AbstractButton button : _buttons) {
              if (button instanceof JToggleButton) {
                  if (button.isSelected()) {
                      return (JToggleButton) button;
                  }
              }
          }
          return null;
      }
docs: Gets the currently selected toggle button, if any.
  
  @return