Bug 67513 [R21PRES] view tab tool tip inconsistent with 2.1
In 2.1, the tab item tool tip appeared in the stack's title bar, not on the tab item itself. The r21presentation currently puts the tip on the tab item. I'll attach a patch that fixes the problem.
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
populateSystemMenu(systemMenuManager);
	}
	/*
	 * Return true if <code>x</code> is over the label image.
	 */
	private boolean overImage(int x) {
		return x < titleLabel.getImage().getBounds().width;
	}
	/**
	 * @param systemMenuManager
	 */
	private void populateSystemMenu(IMenuManager systemMenuManager) {
		systemMenuManager.add(new GroupMarker("misc")); $NON-NLS-1$
		systemMenuManager.add(new GroupMarker("restore")); $NON-NLS-1$
		systemMenuManager.add(new UpdatingActionContributionItem(
				new SystemMenuRestore(getSite())));
		systemMenuManager.add(new SystemMenuMove(getSite(), getPaneName()));
		systemMenuManager.add(new GroupMarker("size")); $NON-NLS-1$
		systemMenuManager.add(new GroupMarker("state")); $NON-NLS-1$
		systemMenuManager.add(new UpdatingActionContributionItem(
				new SystemMenuMinimize(getSite())));
		systemMenuManager.add(new UpdatingActionContributionItem(
				new SystemMenuMaximize(getSite())));
		systemMenuManager.add(new Separator("close")); $NON-NLS-1$
		systemMenuManager.add(new UpdatingActionContributionItem(
				new SystemMenuClose(getSite())));
		getSite().addSystemActions(systemMenuManager);
	}
	protected String getPaneName() {
		return R21PresentationMessages.getString("BasicStackPresentation.pane"); $NON-NLS-1$