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
String shownMessage = message; 
        messageImage = newImage;
        if (!showingError) {
        	
        	updateMessage(shownMessage);
            messageImageLabel.setImage(messageImage);
            setImageLabelVisible(messageImage != null);
            layoutForNewMessage();
        }
    }
    /**
     * Update the contents of the messageLabel.
     * 
     * @param newMessage
     *            the message to use
     */
    private void updateMessage(String newMessage) {
        messageLabel.setText(newMessage);
    }
    /**
     * Sets the title to be shown in the title area of this dialog.
     * 
     * @param newTitle
     *            the title show
     */
    public void setTitle(String newTitle) {
        if (titleLabel == null) {
			return;
		}