@Override
		public void itemStateChanged(ItemEvent e) {

			if (e.getStateChange() == ItemEvent.SELECTED) {
				for (int i = 0; i < developments.length; i++) {
					if (e.getItemSelectable() != developments[i]
							&& developments[i].isSelected() && developments[i].isEnabled()) {
						developments[i].setSelected(false);
					}
				}
			}
		}