public void createPartControl(Composite parent)
	{
		// TableViewer //
		viewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL
			| SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.BORDER);
		// create columns
		createColumns(parent, viewer);
		// make lines and header visible
		final Table table = viewer.getTable();
		table.setHeaderVisible(true);
		table.setLinesVisible(true);

		viewer.setContentProvider(new ArrayContentProvider());
		// set the content for the viewer
		viewer.setInput(DlyConnector.INSTANCE.getChanges());
		getSite().setSelectionProvider(viewer);

		// Menu //
		MenuManager menuManager = new MenuManager();
		Menu menu = menuManager.createContextMenu(viewer.getTable());
		// set the menu on the SWT widget
		viewer.getTable().setMenu(menu); 
		// register the menu with the framework
		getSite().registerContextMenu(menuManager, viewer);
	}

   public Object execute(ExecutionEvent event) throws ExecutionException
   {
		 System.out.print("Part " +
			HandlerUtil.getActiveWorkbenchWindow(event).getActivePage().getActivePart().getTitle() + ": ");
		 ISelection selection = HandlerUtil.getActiveWorkbenchWindow(event)
					   .getActivePage().getSelection();
		 System.out.println(selection == null?"null":"not null");
		 // loop over items
		 int i = 0;
		 if (selection != null & selection instanceof IStructuredSelection)
		 {
				IStructuredSelection strucSelection = (IStructuredSelection) selection;
				for (Iterator<Object> iterator = strucSelection.iterator(); iterator
							  .hasNext();)
				{
					   Object element = iterator.next();
					   System.out.println(element.toString());
					   i++;
				}
		 }
	}

	public void createPartControl(Composite parent)
	{
		// ... Grid and other components ...

		// TableTree // 
		// full row and multi selection with scrollbars if needed
		Tree tree = new Tree(parent, SWT.BORDER | SWT.H_SCROLL
			| SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.MULTI);
		tree.setHeaderVisible(true);
		tree.setLinesVisible(true);
		createColumns(parent, tree);

		viewer = new TreeViewer(tree);
		viewer.setContentProvider(new ChangeContentProvider());
		viewer.setLabelProvider(new TableLabelProvider());
		// provide changes from database
		viewer.setInput(DlyConnector.INSTANCE.getChangesWithObjects());
		viewer.collapseAll();

		// define layout for the viewer
		GridData gridData = new GridData();
		...
		viewer.getControl().setLayoutData(gridData);

		// Menu //
		MenuManager menuManager = new MenuManager();
		Menu menu = menuManager.createContextMenu(viewer.getControl());
		// set the menu on the SWT widget
		viewer.getControl().setMenu(menu); 
		// register the menu with the framework
		getSite().registerContextMenu(menuManager, viewer);
	}