EModelService service = (EModelService) getSite().getService(EModelService.class);

IViewPart topView = getSite().getPage().showView(topid, "secondid", IWorkbenchPage.VIEW_VISIBLE);
MPart topPart = (MPart) topView .getSite().getService(MPart.class);

IViewPart botView = getSite().getPage().showView(botid, "secondid", IWorkbenchPage.VIEW_VISIBLE);                                   
MPart botPart = (MPart) botView.getSite().getService(MPart.class);

service.detach(topPart, 100, 100, 300, 300);     
service.insert(botPart, topPart, EModelService.BELOW, 1f);

private void combine(  MPartSashContainerElement toInsert, MPartSashContainerElement relTo,   MPartSashContainer newSash, boolean newFirst, float ratio) 
         {
                   MElementContainer<MUIElement> curParent = relTo.getParent();
                   int index = curParent.getChildren().indexOf(relTo);

Object object= s.createModelElement(MPartSashContainer.class);
if(object instanceof MElementContainer<?>)
	{
		@SuppressWarnings("unchecked") 
	         MElementContainer<MUIElement> container = (MElementContainer<MUIElement>) object;
		topPart.setParent(container);
		s.insert(botPart, topPart, EModelService.BELOW, 0.5f); 
        }
					

	private void createCombinedWindow() throws PartInitException {

		EModelService service = (EModelService) getSite().getService(EModelService.class);
		Random random = new Random();
		String tempRandomSecondID = String.valueOf(random.nextInt(10000));

		IViewPart topView = getSite().getPage().showView("testbugproject.topview", tempRandomSecondID,
				IWorkbenchPage.VIEW_VISIBLE);
		IViewPart botView = getSite().getPage().showView("testbugproject.botview", tempRandomSecondID,
				IWorkbenchPage.VIEW_VISIBLE);
		MPart topPart = (MPart) topView.getSite().getService(MPart.class);
		MPart botPart = (MPart) botView.getSite().getService(MPart.class);
	
		MWindow window = service.getTopLevelWindowFor(topPart);
		MPerspective thePersp = service.getPerspectiveFor(topPart);

		MWindowElement container = wrapElementsInContainer(service, topPart, botPart);
		MTrimmedWindow newWindow = createNewWindow(service);
		newWindow.getChildren().add(container);

		if (thePersp != null) {
			thePersp.getWindows().add(newWindow);
		} else if (window != null) {
			window.getWindows().add(newWindow);
		}
	}
	
	private MWindowElement wrapElementsInContainer(EModelService service, MPartSashContainerElement top,
			MPartSashContainerElement bot) {
		if (top.getCurSharedRef() != null) {
			top = top.getCurSharedRef();
		}
		if (bot.getCurSharedRef() != null) {
			bot = bot.getCurSharedRef();
		}

		MPartSashContainer sashcontainer = service.createModelElement(MPartSashContainer.class);
		top.getParent().getChildren().remove(top);
		bot.getParent().getChildren().remove(bot);
		MPartStack newTop = wrapElementForWindow(service, top);
		MPartStack newBot = wrapElementForWindow(service, bot);
		newTop.setContainerData("5000");
		newBot.setContainerData("5000");
		sashcontainer.setHorizontal(false);
		sashcontainer.getChildren().add(newTop);
		sashcontainer.getChildren().add(newBot);
		return sashcontainer;

	}

	private MTrimmedWindow createNewWindow(EModelService service) {
		MTrimmedWindow newWindow = service.createModelElement(MTrimmedWindow.class);
		newWindow.setX(100);
		newWindow.setY(100);
		newWindow.setWidth(300);
		newWindow.setHeight(300);
		return newWindow;
	}