@Override
			public void handleEvent(Event e) {
				int[] order = tree.getColumnOrder();
				for (int i = 0; i < order.length / 2; i++) {
					int temp = order[i];
					order[i] = order[order.length - i - 1];
					order[order.length - i - 1] = temp;
				}
				tree.setColumnOrder(order);
			}