Bug 164984 [JFace] DefaultToolTip shouldn't be abstract
since all values can be accessed using getter/setter there's no need any more to declare it abstract.
bundles/org.eclipse.jface/src/org/eclipse/jface/window/DefaultToolTip.java
/**
	 * The background {@link Color} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the {@link Color} or <code>null</code> if default background
	 *         color should be used
	 */
	protected Color getBackgroundColor(Event event) {
		return (backgroundColor == null) ? event.widget.getDisplay()
				.getSystemColor(SWT.COLOR_INFO_BACKGROUND) : backgroundColor;
	}
	/**
	 * The background {@link Image} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the {@link Image} or <code>null</code> if no image should be
	 *         displayed in the background
	 */
	protected Image getBackgroundImage(Event event) {
		return backgroundImage;
	}
	/**
	 * The {@link Font} used by {@link CLabel} in the default implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip