// Some code to reach the editor.
		ServicesRegistry serviceRegistry;
		ISashWindowsContainer container;
		try {
			serviceRegistry = ServiceUtilsForActionHandlers.getInstance().getServiceRegistry();
			container = ServiceUtils.getInstance().getISashWindowsContainer(serviceRegistry);
		} catch (ServiceException e) {

			e.printStackTrace();
			return;	
		}  

		// Get editor.
		IEditorPart activeEditor = container.getActiveEditor();			
		DiagramEditorWithFlyOutPalette dewfop = (DiagramEditorWithFlyOutPalette) 
				((DiagramEditorWithFlyOutPalette) activeEditor);

		// Create a new drawer
		PaletteDrawer pd = new PaletteDrawer("New Drawer");
		PaletteRoot pr = dewfop.getDiagramGraphicalViewer().getEditDomain().getPaletteViewer().getPaletteRoot();
		pr.add(pd);

		// Add a new tool to drawer
		//PaletteFactory pf = PaletteFactory.Adapter
		PaletteToolEntry entry = new PaletteToolEntry("label", "Tool", null); //What to do with the third parameter?
		pd.add(entry);

//in the MyPaletteProvider class: 
	private ToolEntry createSubmachineState3CreationTool() {
		Stereotype someStereo = myFindSomeStereotypeToApply();
		List<IElementType> types = myComputeListOfApplicableElementTypes();
		MyToolEntry entry = new MyToolEntry(types, someStereo);
		entry.setId(...);
		entry.setSmallIcon(...);
		entry.setLargeIcon(...);
		entry.setToolClass(CreateSubmachineStateTool.class);
		return entry;
	}

	private static class MyToolEntry extends ToolEntry {

		private final List<IElementType> myElementTypes;

		private final Stereotype myStereo;

		public MyToolEntry(List<IElementType> elementTypes, Stereotype stereo) {
			super("Label", "Desc", null, null);
			myElementTypes = elementTypes;
			myStereo = stereo;
		}

		@Override
		public Tool createTool() {
			return new MyWithStereotypeTool(myElementTypes, myStereo);
		}

	}

	private static class MyWithStereotypeTool extends UnspecifiedTypeCreationTool {

		public static final String PROP_NAME = "StereotypeToAdd";

		private final Stereotype myUmlStereo;

		public MyWithStereotypeTool(List<IElementType> elementTypes, Stereotype umlStereo) {
			super(elementTypes);
			myUmlStereo = umlStereo;
		}

		@Override
		protected Request createTargetRequest() {
			CreateUnspecifiedTypeRequest request = (CreateUnspecifiedTypeRequest) super.createTargetRequest();
			//below is the only way to propagate extended data into IEditCommandRequest#parameters  
			HashMap extendedData = new HashMap();
			extendedData.putAll(request.getExtendedData());
			extendedData.put(PROP_NAME, myUmlStereo);
			request.setExtendedData(extendedData);
			return request;
		}
	}

	//somewhere in XXXElementHelper
	protected ICommand getConfigureCommand(final ConfigureRequest req) {
		if (req.getParameter(MyWithStereotypeTool.PROP_NAME) instanceof Stereotype) {
			return new AbstractTransactionalCommand(req.getEditingDomain(), "Applying the stereo", null) {
				@Override
				protected CommandResult doExecuteWithResult(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
					Stereotype applyMe = (Stereotype)req.getParameter(MyWithStereotypeTool.PROP_NAME);
					customApplyUMLStereotype(req.getElementToConfigure(), applyMe);
					return CommandResult.newOKCommandResult();
				}
			};
		}
		return null;
	}

//in the diagram editor: 
	public void refreshPalette() {
		PaletteRoot paletteRoot = getEditDomain().getPaletteViewer().getPaletteRoot();
		cleanPaletteRoot(paletteRoot);
		createPaletteRoot(paletteRoot);
	}

	private void cleanPaletteRoot(PaletteRoot paletteRoot) {
		List<Object> entries = new ArrayList<Object>();
		entries.addAll(paletteRoot.getChildren());
		for (Object entry : entries) {
			PaletteEntry paletteEntry = (PaletteEntry) entry;
			// we don't repaint standard palette group
			if (PaletteService.GROUP_STANDARD.equals(paletteEntry.getId())) {
				continue;
			}
			paletteRoot.remove(paletteEntry);
		}
	}

		XXXDiagramEditor editop = reachTheEditor(...);
		editor.refreshPalette();

	// Get editor.
		IEditorPart activeEditor = container.getActiveEditor();			
		DiagramEditorWithFlyOutPalette dewfop = (DiagramEditorWithFlyOutPalette) 
				((DiagramEditorWithFlyOutPalette) activeEditor);

		// Create a new drawer
		PaletteDrawer pd = new PaletteDrawer("My drawer");
		PaletteRoot pr = dewfop.getDiagramGraphicalViewer().getEditDomain().getPaletteViewer().getPaletteRoot();
		pr.add(pd);

		// Add a new tool kit to drawer
		List<CreationToolEntry> cteList = new ArrayList();
		for(int i = 0; i < MyDatabase.size(); ++i)
		{
			CreationToolEntry cte = new CreationToolEntry("New Tool" + i, "Add new ...", new MyCreationFactory(Class.class, MyDatabase.get(i).getName(), MyDatabase, window), null, null);
			cteList.add(cte);
		}

		pd.addAll(cteList); // add all the new tools