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
getSite().dragStart(
						paneFolder.getControl().toDisplay(localPos), false);
				return;
			}
			IPresentablePart part = getPartForTab(tabUnderPointer);
			if (getSite().isPartMoveable(part)) {
				getSite().dragStart(part,
						paneFolder.getControl().toDisplay(localPos), false);
			}
		}
	};
	private Listener selectionListener = new Listener() {
		public void handleEvent(Event e) {
			IPresentablePart item = getPartForTab((CTabItem) e.item);
			if (item != null) {
				getSite().selectPart(item);
			}
		}
	};
	private Listener resizeListener = new Listener() {
		public void handleEvent(Event e) {
			setControlSize();
		}
	};
	private IPropertyListener childPropertyChangeListener = new IPropertyListener() {
		public void propertyChanged(Object source, int property) {
			if (source instanceof IPresentablePart) {
				IPresentablePart part = (IPresentablePart) source;
				childPropertyChanged(part, property);
			}