Bug 131771 Match animated message behaviour in Preferences
An enhancement should be made to Preferences so that warnings and errors show up in a sliding message area like it they do in TitleAreaDialog.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/TitleAreaDialog.java
/**
     * Image registry key for error message image.
     */
    public static final String DLG_IMG_TITLE_ERROR = DLG_IMG_MESSAGE_ERROR;
    /**
     * Image registry key for banner image (value
     * <code>"dialog_title_banner_image"</code>).
     */
    public static final String DLG_IMG_TITLE_BANNER = "dialog_title_banner_image";
    /**
     * Message type constant used to display an info icon with the message.
     * 
     * @since 2.0
     * @deprecated
     */
    public final static String INFO_MESSAGE = "INFO_MESSAGE"; 
    /**
     * Message type constant used to display a warning icon with the message.
     *