* Stop listening to a config and its elements.
*/
public void stopListening() {
if (config != null) {
Config2DModel config2DModel = (Config2DModel) config;
config2DModel.removeListener(listenerConfig2D);
Dimension2DYModel dimension2DYModel = (Dimension2DYModel) config2DModel.getDimensionY();
dimension2DYModel.removeListener(listenerDimension2DY);
for (IActuator actuator : dimension2DYModel.getActuatorsList()) {