Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonNavigator.java
*/
	protected void handleDoubleClick(DoubleClickEvent anEvent) {
		IAction openHandler = getViewSite().getActionBars().getGlobalActionHandler(ICommonActionConstants.OPEN);
		
		if(openHandler == null) {
			IStructuredSelection selection = (IStructuredSelection) anEvent
					.getSelection();
			Object element = selection.getFirstElement();
	
			TreeViewer viewer = getCommonViewer();
			if (viewer.isExpandable(element)) {
				viewer.setExpandedState(element, !viewer.getExpandedState(element));
			}
		}
	}
	/**
	 * <p>
	 * The Common Navigator Manager handles the setup of the Common Navigator
	 * Menu, manages updates to the ActionBars from
	 * {@link CommonActionProvider}&nbsp; extensions as the user's selection
	 * changes, and also updates the status bar based on the current selection.
	 * 
	 * @return The Common Navigator Manager class which handles menu population
	 *         and ActionBars
	 *         
	 * @since 3.4        
	 */
	protected CommonNavigatorManager createCommonManager() {
		return new CommonNavigatorManager(this, memento);
	}