Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
list.add(part.getControl());
			if (getPaneFolder() != null)
				list.add(getPaneFolder().getControl());
		} else {
			if (getPaneFolder() != null)
				list.add(getPaneFolder().getControl());
			if (part.getToolBar() != null)
				list.add(part.getToolBar());
			if (part.getControl() != null)
				list.add(part.getControl());
		}
		return (Control[]) list.toArray(new Control[list.size()]);
	}
	protected void showList(Shell parentShell, int x, int y) {