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
return paneFolder.getItemCount();
		}
		CTabItem[] items = paneFolder.getItems();
		for (int idx = 0; idx < items.length; idx++) {
			IPresentablePart tabPart = getPartForTab(items[idx]);
			if (part == tabPart) {
				return idx;
			}
		}
		return items.length;
	}
	/**
	 * Returns the tab for the given part, or null if there is no such tab
	 * 
	 * @param part
	 *            the part being searched for
	 * @return the tab for the given part, or null if there is no such tab
	 */
	protected final CTabItem getTab(IPresentablePart part) {
		CTabItem[] items = paneFolder.getItems();
		int idx = indexOf(part);
		if (idx < items.length) {
			return items[idx];
		}
		return null;
	}
	/**
	 * @param part
	 * @param property
	 */