variation to srohde's example - uses Air.HTML window rather than a browser, and doesn't force the user to manually enter a pin following authentication.

TwitterExample - Using Air HTML rather than Browser

<?xml version="1.0" encoding="utf-8"?>
<!-- Example app for github.com/srohde/Twitter -->
<s:WindowedApplication height="350" width="765"
					   xmlns:fx="http://ns.adobe.com/mxml/2009"
					   xmlns:s="library://ns.adobe.com/flex/spark"
					   xmlns:mx="library://ns.adobe.com/flex/halo"
					   xmlns:twitter="com.soenkerohde.twitter.*"
					   xmlns:mx1="library://ns.adobe.com/flex/mx"
					   currentState="initial"
					   creationComplete="creationCompleteHandler(event)">

	<fx:Declarations>
		<s:TraceTarget/>
		<!-- TODO Enter your Twitter Consumer Key/Secret -->
		<twitter:Twitter id="twitter"
						 consumerKey=""
						 consumerSecret=""/>
	</fx:Declarations>

	<fx:Script>
		<![CDATA[
			import com.soenkerohde.twitter.event.TwitterOAuthEvent;
			import com.soenkerohde.twitter.event.TwitterStatusEvent;
			import com.soenkerohde.twitter.event.TwitterUserEvent;

			import flash.events.MouseEvent;
			import flash.net.SharedObject;

			import mx.controls.Alert;
			import mx.events.FlexEvent;
			import mx.managers.CursorManager;

			import org.iotashan.oauth.OAuthToken;

			private var accessToken : OAuthToken;

			[Bindable]
			private var pinPending : Boolean = false;

			[Bindable]
			private var statusPending : Boolean = false;

			[Bindable]
			private var screenName : String;

			protected function creationCompleteHandler(event : FlexEvent) : void
			{
				authenticate();
			}

			private function authenticate() : void
			{
				var so : SharedObject = SharedObject.getLocal("twitter");

				var token : Object = so.data["accessToken"];

				// user has already an AccessToken
				if (token != null)
				{
					CursorManager.setBusyCursor();
					accessToken = new OAuthToken(token.key, token.secret);
					verifyAccessToken(accessToken);

				}
				// user is not authenticated yet 
				else
				{
					currentState = "unauthenticated";

					twitter.addEventListener(TwitterOAuthEvent.REQUEST_TOKEN, onRequestToken);
					htmlWindow.addEventListener(Event.LOCATION_CHANGE, onLocationChange);

					twitter.authenticate();
				}
			}

			protected function verifyAccessToken(token : OAuthToken) : void
			{
				twitter.addEventListener(TwitterUserEvent.USER_INFO, userInfoHandler);
				twitter.addEventListener(TwitterUserEvent.USER_ERROR, userErrorHandler);
				twitter.verifyAccessToken(token);
			}

			private function userInfoHandler(event : TwitterUserEvent) : void
			{
				currentState = "authenticated";
				CursorManager.removeBusyCursor();
				screenName = event.screenName;
				twitter.removeEventListener(TwitterUserEvent.USER_INFO, userInfoHandler);
				twitter.removeEventListener(TwitterUserEvent.USER_ERROR, userErrorHandler);
			}

			private function userErrorHandler(event : TwitterUserEvent) : void
			{
				currentState = "unauthenticated";
				CursorManager.removeBusyCursor();
				twitter.removeEventListener(TwitterUserEvent.USER_INFO, userInfoHandler);
				twitter.removeEventListener(TwitterUserEvent.USER_ERROR, userErrorHandler);
			}

			//GET THE ACTUAL OAUTH TOKEN
			private function onRequestToken(event : TwitterOAuthEvent) : void
			{
				event.preventDefault();
				htmlWindow.location = Twitter.AUTHORIZE + "?oauth_token=" + event.token.key;
			}

			private function onLocationChange(event : Event) : void
			{
				var location : String = htmlWindow.location;

				var callbackIndex : int = location.search(Twitter.TWITTER_CALLBACK_URL);
				if ((callbackIndex == 0) && (location.search("oauth_token") > -1))
				{
					twitter.addEventListener(TwitterOAuthEvent.ACCESS_TOKEN, accessTokenHandler);
					twitter.obtainAccessToken();
				}
			}

			private function accessTokenHandler(event : TwitterOAuthEvent) : void
			{
				var so : SharedObject = SharedObject.getLocal("twitter");
				so.data["accessToken"] = event.token;
				so.flush();

				currentState = "authenticated";
				pinPending = false;
				CursorManager.removeBusyCursor();
				twitter.removeEventListener(TwitterOAuthEvent.ACCESS_TOKEN, accessTokenHandler);

				verifyAccessToken(event.token);
			}

			protected function statusClickHandler(event : MouseEvent) : void
			{
				statusPending = true;
				CursorManager.setBusyCursor();
				twitter.addEventListener(TwitterStatusEvent.STATUS_SEND, statusSendHandler);
				twitter.setStatus(accessToken, statusMessage.text);
			}

			private function statusSendHandler(event : TwitterStatusEvent) : void
			{
				Alert.show("Your message was successfully sent.", "Status Updated");
				statusPending = false;
				statusMessage.text = "";
				CursorManager.removeBusyCursor();
				twitter.removeEventListener(TwitterStatusEvent.STATUS_SEND, statusSendHandler);
			}

			protected function logoutClickHandler(event : MouseEvent) : void
			{
				var so : SharedObject = SharedObject.getLocal("twitter");
				so.data["accessToken"] = null;
				so.flush();
				currentState = "unauthenticated";
				authenticate();
			}
		]]>
	</fx:Script>

	<s:states>
		<s:State name="initial"/>
		<s:State name="unauthenticated"/>
		<s:State name="authenticated"/>
	</s:states>

	<s:Label text="Loading"
			 verticalCenter="0" horizontalCenter="0"
			 includeIn="initial"/>

	<s:Group verticalCenter="0" horizontalCenter="0"
			 includeIn="unauthenticated">
		<mx1:HTML id="htmlWindow"/>
	</s:Group>

	<s:Group verticalCenter="0" horizontalCenter="0"
			 includeIn="authenticated">
		<s:layout>
			<s:VerticalLayout/>
		</s:layout>
		<s:Label text="Hello {screenName}"/>
		<s:Label text="Set Status"
				 enabled="{!statusPending}"/>
		<s:TextArea id="statusMessage"/>
		<s:Button label="Send"
				  enabled="{!statusPending &amp;&amp; statusMessage.text != ''}"
				  click="statusClickHandler(event)"/>
		<s:Button label="Logout"
				  click="logoutClickHandler(event)"/>
	</s:Group>

</s:WindowedApplication>