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
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.skins.StackPresentation#addPart(org.eclipse.ui.internal.skins.IPresentablePart,
	 *      org.eclipse.ui.internal.skins.IPresentablePart)
	 */
	public void addPart(IPresentablePart newPart, Object cookie) {
		int idx;
		if (cookie instanceof Integer) {
			idx = ((Integer) cookie).intValue();
		} else {
			
			idx = paneFolder.getItemCount();
		}
		addPart(newPart, idx);
	}
	/**
	 * Adds the given presentable part to this presentation at the given index.
	 * Does nothing if a tab already exists for the given part.
	 * 
	 * @param newPart
	 * @param index
	 */
	public void addPart(IPresentablePart newPart, int index) {
		
		if (getTab(newPart) != null) {
			return;
		}
		createPartTab(newPart, index);