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
*/
	public StackDropResult dragOver(Control currentControl, Point location) {
		
		Point localPos = paneFolder.getControl().toControl(location);
		final CTabItem tabUnderPointer = paneFolder.getItem(localPos);
		
		
		if (tabUnderPointer == null)
			return null;
		
		int dragOverIndex = paneFolder.indexOf(tabUnderPointer);
		return new StackDropResult(Geometry.toDisplay(paneFolder.getControl(),
				tabUnderPointer.getBounds()), new Integer(dragOverIndex));
	}
	/**
	 * Returns the toolbar control for the currently selected part, or null if
	 * none (not all parts have a toolbar).
	 * 
	 * @return the current toolbar or null if none
	 */
	protected Control getCurrentToolbar() {
		IPresentablePart part = getCurrentPart();
		if (part == null) {
			return null;
		}
		return part.getToolBar();
	}
	/*
	 * (non-Javadoc)
	 *