Bug 262606 [CommonNavigator] Up button after "go into" has bad tooltip text
I20090127-0100 1) Select a Java project 2) right-click, select "Go Into" 3) Hover over the Up button, the tooltip text is impressive
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonNavigator.java
if (adapter == COMMON_VIEWER_CLASS) {
			return getCommonViewer();
		} else if (adapter == INAVIGATOR_CONTENT_SERVICE) {
			return getCommonViewer().getNavigatorContentService();
		} else if (adapter == ISHOW_IN_TARGET_CLASS) {
			return this;
		} else if (adapter == ISHOW_IN_SOURCE_CLASS) {
            return getShowInSource();
        }
		return super.getAdapter(adapter);
	}
    /**
     * Returns the <code>IShowInSource</code> for this view.
     */
    private IShowInSource getShowInSource() {
        return new IShowInSource() {
            public ShowInContext getShowInContext() {
                return new ShowInContext(getCommonViewer().getInput(), getCommonViewer().getSelection());
            }
        };
    }
	/**
	 * @return The Navigator Content Service which populates this instance of
	 *         Common Navigator
	 */
	public NavigatorActionService getNavigatorActionService() {
		return commonManager.getNavigatorActionService();
	}
	/**
	 * <p>