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The SkinnableItemRenderer is used exactly like s:ItemRenderer.  The difference being SkinnableItemRenderer
allows you to use SkinPart metadata in your ItemRenderer definition.  As a result of being able to skin the
item renderer, the autoDrawBackground capabilities are lost as the super class is no longer Group/GroupBase.  
This is the only lost functionality in SkinnableItemRenderer.  The example Flex project is in the repository, 
which includes the examples below.

Example Application:

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 

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This example shows how you would set the scroll position of a scrollable 
component to the max scroll position in Flex 3 and how it is handled in Flex 4.

// Flex 4
// myView = Some view class.
// myScroller = s:Scroller
// myContentContainer = s:Group

var maxScrollPosition:Number = myView.myContentContainer.height - myView.myScroller.viewport.height;
myView.myScroller.viewport.verticalScrollPosition = maxScrollPosition;

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/* Creating a Mongo object requires you have the
domain to your mongodb server and the port number,
the default is 27017.*/
var mongo:Mongo = new Mongo("your.mongo.com", 27017);

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/* Accessing a database is done using the db() method */
mongo.db("myDatabase")


/* A reference can be stored to the DB object. */
var myDatabase:DB = mongo.db("myDatabase");



/* Accessing a collection is using the collection() method,

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/* Add a handler to the connected Signal object to hook
in to when the database has established a connection */
mongo.db("myDatabase").connected.add(_onDBConnected);

/* Call connect() to try a connection with mongodb */
mongo.db("myDatabase").connect();

/* The Signal handler must accept a DB object, it is
a referece to the mongo.db("myDatabase") object. */
function onDBConnected(db:DB):void

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function onDBConnected(db:DB):void
{
    /* First create a Credentials object using your username/password */
    var dbCredentials:Credentials = new Credentials("db_user_name", "db_user_password");

    /* Add callback handlers for authentication problems and authenticated
    Signals objects */
    mongo.db("myDatabase").authenticationProblem.add(onAuthenticationProblem);
    mongo.db("myDatabase").authenticated.add(onDBAuthenticated);

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/* The Document object is used to represent BSON documents
and queries to perform mongodb operations. An empty BSON
document is just a blank Document instance */
var document:Document = new Document();


/* Documents whose properties are all String and number
type values can be created inline using the Document
constructor, {"hello":"world", "type":"message"} is 
written inline as below */

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/* All the commands can be executing with the Document object. Simple
commands such as "getLastError" are run as below. The Document requires
a colon in all entries using shorthand, thus "getLastError:" */
mongo.db("myDatabase").runCommand(new Document("getLastError:")).addOnce(onLastError);

function onLastError(opReply:OpReply):void
{
    // The command response document will be in the first element
    // of the documents Array in the OpReply object. The structure
    // of the document will depend on the command executed.

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/* The findOne() method will take a query and return a single document. The
query is built using the Document class. If no second argument is used in
the find() one method all fields are returned for the document. */
var query:Document = new Document("fieldName:searchValue");
mongo.db("myDatabase").collection("myCollection").findOne(query).addOnce(findOneReply);


/* Returned fields can be limited by using the return fields document. */
var returnFields:Document = new Document("fieldName:1");
var query:Document = new Document("fieldName:searchValue");

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/* To specify how many documents to return at a time as well as other find() options
use a FindOptions object. */
const findOptions:FindOptions = new FindOptions();
findOptions.numberToSkip = 0;
findOptions.numberToReturn = 10;

/* Query is handled the same as findOne(), but the handler callback signature
is different for a find() */
const query:Document = new Document("name:Hello from Flash sucka!");
mongo.db("myDatabase").collection("myCollection").find(query, findOptions).add(onCursorReady);