Bug 323389 Prompt required when resetting perspectives from the perspective switcher
We prompt in 3.x, so we should prompt in 4.x.
bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/perspectiveswitcher/PerspectiveSwitcher.java
createItem.setImage(getOpenPerspectiveImage(psTB.getDisplay()));
		createItem.setToolTipText("Open Perspective"); 
		createItem.addSelectionListener(new SelectionListener() {
			public void widgetSelected(SelectionEvent e) {
				selectPerspective();
			}
			public void widgetDefaultSelected(SelectionEvent e) {
				selectPerspective();
			}
		});
		new ToolItem(psTB, SWT.SEPARATOR);
		MPerspectiveStack stack = getPerspectiveStack();
		if (stack != null) {
			
			for (MPerspective persp : stack.getChildren()) {
				if (persp.isToBeRendered()) {
					addPerspectiveItem(persp);
				}
			}
		}
	}
	private Image getOpenPerspectiveImage(Display display) {
		ImageDescriptor desc = WorkbenchImages
				.getImageDescriptor(IWorkbenchGraphicConstants.IMG_ETOOL_NEW_PAGE);
		return desc.createImage();
	}
	MPerspectiveStack getPerspectiveStack() {
		List<MPerspectiveStack> psList = modelService.findElements(window, null,
				MPerspectiveStack.class, null);
		if (psList.size() > 0)