@Override
		public void widgetSelected(SelectionEvent event) {
			if (event.detail == SWT.ARROW) {
				CoolItem item = (CoolItem) event.widget;
				Rectangle itemBounds = item.getBounds ();
				Point pt = coolBar.toDisplay(new Point(itemBounds.x, itemBounds.y));
				itemBounds.x = pt.x;
				itemBounds.y = pt.y;
				ToolBar bar = (ToolBar) item.getControl ();
				ToolItem[] tools = bar.getItems ();
				
				int i = 0;
				while (i < tools.length) {
					Rectangle toolBounds = tools[i].getBounds ();
					pt = bar.toDisplay(new Point(toolBounds.x, toolBounds.y));
					toolBounds.x = pt.x;
					toolBounds.y = pt.y;
					
					/* Figure out the visible portion of the tool by looking at the
					 * intersection of the tool bounds with the cool item bounds. */
			  		Rectangle intersection = itemBounds.intersection (toolBounds);
			  		
					/* If the tool is not completely within the cool item bounds, then it
					 * is partially hidden, and all remaining tools are completely hidden. */
			  		if (!intersection.equals (toolBounds)) break;
			  		i++;
				}
				
				/* Create a menu with items for each of the completely hidden buttons. */
				if (chevronMenu != null) chevronMenu.dispose();
				chevronMenu = new Menu (coolBar);
				for (int j = i; j < tools.length; j++) {
					MenuItem menuItem = new MenuItem (chevronMenu, SWT.PUSH);
					menuItem.setText (tools[j].getText());
				}
				
				/* Drop down the menu below the chevron, with the left edges aligned. */
				pt = coolBar.toDisplay(new Point(event.x, event.y));
				chevronMenu.setLocation (pt.x, pt.y);
				chevronMenu.setVisible (true);
			}
		}