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
childLayout.marginHeight = 0;
        childLayout.marginWidth = 0;
        childLayout.verticalSpacing = 0;
        workArea.setLayout(childLayout);
        Control top = createTitleArea(contents);
        resetWorkAreaAttachments(top);
        workArea.setFont(JFaceResources.getDialogFont());
        
        initializeDialogUnits(workArea);
        
        dialogArea = createDialogArea(workArea);
        buttonBar = createButtonBar(workArea);
        return contents;
    }
    /**
     * Creates and returns the contents of the upper part of this dialog (above
     * the button bar).
     * <p>
     * The <code>Dialog</code> implementation of this framework method creates
     * and returns a new <code>Composite</code> with no margins and spacing.
     * Subclasses should override.
     * </p>
     * 
     * @param parent
     *            The parent composite to contain the dialog area
     * @return the dialog area control
     */
    protected Control createDialogArea(Composite parent) {
        
        Composite composite = new Composite(parent, SWT.NONE);