cancelBehaviours.add(new DefaultCancelBehaviour());
}
@Override
protected void initEventBehaviours( EditToolConfigurationHelper helper ) {
helper.add( new DrawCreateVertexSnapAreaBehaviour());
helper.startMutualExclusiveList();
helper.startOrderedList(false);
helper.add( new AddVertexWhileCreatingBehaviour());
helper.add( new AcceptWhenOverFirstVertexBehaviour());