Bug 97821 [package explorer] eternal loop when recreating deleted compilation unit
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
if (fFilterUpdater != null)
			ResourcesPlugin.getWorkspace().removeResourceChangeListener(fFilterUpdater);
		if (fWorkingSetModel != null)
			fWorkingSetModel.dispose();
		super.dispose();	
	}
	/**
	 * Implementation of IWorkbenchPart.createPartControl(Composite)
	 */
	public void createPartControl(Composite parent) {
		final PerformanceStats stats= PerformanceStats.getStats(PERF_CREATE_PART_CONTROL, this);
		stats.startRun();
		fViewer= createViewer(parent);
		fViewer.setUseHashlookup(true);
		
		initDragAndDrop();
		
		setProviders();
		
		JavaPlugin.getDefault().getPreferenceStore().addPropertyChangeListener(this);
	
		
		MenuManager menuMgr= new MenuManager("#PopupMenu"); 
		menuMgr.setRemoveAllWhenShown(true);
		menuMgr.addMenuListener(this);
		fContextMenu= menuMgr.createContextMenu(fViewer.getTree());
		fViewer.getTree().setMenu(fContextMenu);
		
		
		IWorkbenchPartSite site= getSite();