How to import XML into FLex 3 Advanced Data Grid?

Alright, i am new to flex but am familiar with flash and php.  What i am trying to do is populate flex 3 advanced datagrid with an xml file that is created at runtime.  So in other words if i use the url http://www.blah.com/makexml.php i get back the hypothetically xml below.

<?xml version="1.0" encoding="ISO-8859-1"?>

<results>

  <row>

    <DIST_ID>104831</DIST_ID>

    <ROMAN_NAME_1>Doerrier, David</ROMAN_NAME_1>

    <ROMAN_NAME_2>null</ROMAN_NAME_2>

  </row>

  <row>

    <DIST_ID>104832</DIST_ID>

    <ROMAN_NAME_1>Pereira Coutinho, Benjamin</ROMAN_NAME_1>

    <ROMAN_NAME_2>null</ROMAN_NAME_2>

  </row>

  <row>

    <DIST_ID>104833</DIST_ID>

    <ROMAN_NAME_1>sutton, David A</ROMAN_NAME_1>

    <ROMAN_NAME_2>null</ROMAN_NAME_2>

  </row>

  <row>

    <DIST_ID>104834</DIST_ID>

    <ROMAN_NAME_1>Berdin, Frian Joy Y</ROMAN_NAME_1>

    <ROMAN_NAME_2>null</ROMAN_NAME_2>

  </row>

  <row>

    <DIST_ID>104835</DIST_ID>

    <ROMAN_NAME_1>Good Health Maui Inc</ROMAN_NAME_1>

    <ROMAN_NAME_2>null</ROMAN_NAME_2>

  </row>

</results>

So how do i call for that xml in flex and how do i populate the advanced datagrid with the three columns