Drop Down Menu using controlP5, controlEvent monitor doing nothing.

Hi all. First post here so please be gentle :-)

Been trying to get a drop down menu to work, based on the example below, the menu displays and responds fine but i can't figure out how to read what 've actually selected. The "controlEvent" doesn't appear to respond as I click on menu items. Tried processing 2 and 3 and updated my controlP5 library.

Can anyone offer any help? Thanks.

import controlP5.*;
ControlP5 cp5; // you always need the main class
 int b = 0 ;
void setup() {
  size(300, 300);
  cp5 = new ControlP5(this);

  // add a dropdownlist at position (100,100)
  DropdownList droplist = cp5.addDropdownList("mySuperList").setPosition(100, 100);

  // add items to the dropdownlist
  for (int i=0; i<5; i++) {
    droplist.addItem("myItem " + i, i);
  }
}

void draw() {
  background(0);
  // controlp5 autodraw is on by default (if you use the default JAVA2D renderer)
  // this means the gui is automatically drawn at the end
}

// controlEvent monitors clicks on the gui
void controlEvent(ControlEvent theEvent) {
  if (theEvent.isGroup()) {
    println(theEvent.getGroup() + " => " + theEvent.getGroup().getValue());   // *** this isn't responding ***
  }
}