Bug 4373 Packages View - double clich doesn't expand two hiearchy levels
- enable: Show CU children in packages view - double click on CU observe: only one level gets expanded - now expand a node by clicking on the + observe: two levels get expanded
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
IActionBars actionBars= getViewSite().getActionBars();
		IToolBarManager toolBar= actionBars.getToolBarManager();
		toolBar.add(fBackAction);
		toolBar.add(fForwardAction);
		toolBar.add(fUpAction);
		actionBars.updateActionBars();
	
		IMenuManager menu = actionBars.getMenuManager();
		menu.add(fFilterAction);
		menu.add(fShowLibrariesAction);  
		menu.add(fShowBinariesAction);  
	}
		
	private Object findInputElement() {
		Object input= getSite().getPage().getInput();
		if (input instanceof IWorkspace) { 
			return JavaCore.create(((IWorkspace)input).getRoot());
		} else if (input instanceof IContainer) {
			return JavaCore.create((IContainer)input);
		}
		
		
		
		return JavaCore.create(JavaPlugin.getWorkspace().getRoot());	
	}
	
	/**
	 * Answer the property defined by key.
	 */
	public Object getAdapter(Class key) {