Flex - HttpService - how to display an arraylist in flex combobox

I have written an httpservice which returns an arraylist, in the tomcat logs I can see that an arraylist is being returned properly. However I am not able to display the arraylist

Can any one please let me know what wrong i am doing ?

Also the httpservice has been declared inside the pannel while I am using the dataprovider which is inside a tab navigator, this tab navigator is inside the pannel

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<?xml version="1.0" encoding="utf-8"?>

<mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="800" height="1000">

<mx:HTTPService id="gethttpRequest"

result="gethttpResultHandler(event)"

fault="gethttpFaultHandler(event)"

showBusyCursor="true"

method="post"

>

</mx:HTTPService>

<mx:Script>

<![CDATA[

import mx.controls.Alert;

import mx.collections.XMLListCollection;

import mx.collections.ArrayCollection;

import mx.rpc.events.FaultEvent;

import mx.rpc.events.ResultEvent;

//var priorityarray:Array = new Array;

public function init():void {

var rnd : Number = Math.round(Math.random()*1000);

gethttpRequest.url = "http://localhost:8400/msgtracker/servlet/GetPriorities"+"/"+rnd;

gethttpRequest.send();

}

[Bindable]

var priorityC:Array = new Array;

public function gethttpResultHandler(event:ResultEvent):void {

var priority:ArrayCollection = event.result as ArrayCollection;

priorityC[0] = priority.getItemAt(0);

}

public function gethttpFaultHandler(event:FaultEvent):void {

}

]]>

</mx:Script>

<mx:TabNavigator left="81" right="79" top="41" bottom="196" creationComplete="init()">

<mx:Canvas label="Log a Ticket" width="100%" height="100%">

<mx:Label x="10" y="10" text="Subject"/>

<mx:Label x="10" y="37" text="Description"/>

<mx:TextInput x="99" y="8"/>

<mx:Label x="10" y="133" text="Created Date"/>

<mx:Label x="10" y="103" text="Created By"/>

<mx:TextInput x="99" y="101"/>

<mx:TextInput x="99" y="131"/>

<mx:TextArea x="99" y="36" height="28"/>

<mx:Label x="10" y="83" text="Type"/>

<mx:ComboBox x="99" y="72"></mx:ComboBox>

<mx:Label x="10" y="192" text="Status"/>

<mx:ComboBox x="99" y="192"></mx:ComboBox>

<mx:Label x="10" y="159" text="Priority"/>

<mx:ComboBox x="99" y="159" dataProvider="{priorityC}"></mx:ComboBox>

<mx:Label x="10" y="223" text="Solution"/>

<mx:TextArea x="99" y="222"/>

<mx:ControlBar x="32" y="291" width="264">

<mx:Button label="Submit"/>

<mx:Spacer width="100"/>

<mx:Button label="Cancel"/>

</mx:ControlBar>

</mx:Canvas>

<mx:Canvas label="List All Tickets" width="100%" height="100%">

</mx:Canvas>

</mx:TabNavigator>

</mx:Panel>