Working with XMl

I am trying to create a search of a mySQL database using flash as the front end and PHP as the business logic. The search term is entered into a text input field, that term is sent back in XML form via a LoadVars.sendAndLoad. I can specify a target, but thats the end of it. I can trace it and it works, so I know its getting back to me.

What I'm having trouble with is using the returned XML data and displaying it in a datagrid component. Do I return it in a new XML object, do I have to parse it, do I have to loop it and put it into an array. dataProvider, addelements, Aaargh! I'm totally lost. I dont know how to use any of these statements.

Here is what I have so far...

var searchResultsXML:XML = new XML ();
searchResultsXML.onData = function (str) {
trace(str);
}

var searchEngine:Object = new Object ();
searchEngine.click = function ()
{
var searchTerm:LoadVars = new LoadVars ();
searchTerm.term = searchField_txt.text;
searchTerm.sendAndLoad("URL to php script", searchResultsXML, "POST");
}
searchButton.addEventListener("click", searchEngine);

Here is the trace results....

<?xml version="1.0"?>
<citybiz>
<business>
<name>MIRACLE EAR SEARS HEARING AIDE CENTER</name>
</business>
<business>
<name>SEARS AUTO CENTER 2969</name>
</business>
</citybiz>

Any help would be great!