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    <p>Here's what I ended up doing, apparently you can dynamically add new properties to an object with </p> <pre><code> object['new_prop'] = whatever </code></pre> <p>From there, I used a recursive function to iterate through any children so you could have n levels of the hierarchy and if it found anything it would pass up through the chain by reference until the original function found it and acted on it.</p> <pre><code>private function PutChildrenWithParents(accountData : ArrayCollection) : ArrayCollection{ var pos_inner:int = 0; var pos_outer:int = 0; var result:Object = new Object(); while(pos_outer &lt; accountData.length){ if (accountData[pos_outer].ParentId != null){ pos_inner = 0; while(pos_inner &lt; accountData.length){ result = CheckForParent(accountData[pos_inner], accountData[pos_outer].ParentId); if ( result != null ){ if(result.hasOwnProperty('children') == false){ result['children'] = new ArrayCollection(); } result.children.addItem(accountData[pos_outer]); accountData.removeItemAt(pos_outer); pos_inner--; } pos_inner++; } } pos_outer++; } return accountData; } private function CheckForParent(suspectedParent:Object, parentId:String) : Object{ var parentObj:Object; var counter:int = 0; if ( suspectedParent.hasOwnProperty('children') == true ){ while (counter &lt; suspectedParent.children.length){ parentObj = CheckForParent(suspectedParent.children[counter], parentId); if (parentObj != null){ return parentObj; } counter++; } } if ( suspectedParent.Id == parentId ){ return suspectedParent; } return null; } </code></pre>
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