title: flex xml children() method strange behaviour
body: <p>I have the following xml declaration:</p>
  
  <pre><code>public var reqData:XML = &lt;root&gt;
    &lt;Requirement ID="REQ-GEN-0.1" title="exigence gen 1" description="blabla 01" testable="true"/&gt;
    &lt;RequirementSet ID="GUI REQ"&gt;
      &lt;Requirement ID="REQ-GUI-1.1" title="exigence ihm 1" description="blabla 11" testable="true"/&gt;
      &lt;Requirement ID="REQ-GUI-1.2" title="exigence ihm 2" description="blabla 12" testable="false"/&gt;
    &lt;/RequirementSet&gt;
    &lt;RequirementSet ID="PERF REQ"&gt;
      &lt;Requirement ID="REQ-PERF-2.1" title="exigence perf 1" description="blabla 21" testable="true"/&gt;
      &lt;Requirement ID="REQ-PERF-2.2" title="exigence perf 2" description="blabla 22" testable="false"/&gt;
      &lt;Requirement ID="REQ-PERF-2.3" title="exigence perf 3" description="blabla 23" testable="true"/&gt;
      &lt;Requirement ID="REQ-PERF-2.4" title="exigence perf 4" description="blabla 24" testable="false"/&gt;
      &lt;Requirement ID="REQ-PERF-2.5" title="exigence perf 5" description="blabla 25" testable="false"/&gt;
      &lt;Requirement ID="REQ-PERF-2.6" title="exigence perf 6" description="blabla 26" testable="false"/&gt;
    &lt;/RequirementSet&gt;
    &lt;RequirementSet ID="BUS REQ"&gt;
      &lt;RequirementSet ID="BUS 1 REQ"&gt;
        &lt;Requirement ID="REQ-BUS-3.1.1" title="exigence bus 1" description="blabla 311" testable="false"/&gt;
        &lt;Requirement ID="REQ-BUS-3.1.2" title="exigence bus 2" description="blabla 312" testable="true"/&gt;
      &lt;/RequirementSet&gt;
      &lt;RequirementSet ID="BUS 2 REQ"&gt;
        &lt;Requirement ID="REQ-BUS-3.2.1" title="exigence bus3" description="blabla 321" testable="true"/&gt;
      &lt;/RequirementSet&gt;
      &lt;RequirementSet ID="BUS 3 REQ"/&gt;
    &lt;/RequirementSet&gt;
  &lt;/root&gt;;
  </code></pre>
  
  <p>I populated an advanced datagrid with this xml but the problem is that a requirement isn't detected: <code>&lt;Requirement ID="REQ-BUS-3.2.1" title="exigence bus3" description="blabla 321" testable="true"/&gt;</code></p>
  
  <p>I've overriden a method of the HierarchicalData class to see what happenned:</p>
  
  <pre><code>override public function canHaveChildren(node:Object):Boolean
          {
              if (node is XML &amp;&amp; node != null){
                  var xmlNode:XML = node as XML;
                  trace("node:"+node);
                  trace("node.children:"+node.children());
                  trace("xmlNode.name:"+xmlNode.name());
                  trace("xmlNode.localName:"+xmlNode.localName());
                  trace("xmlNode.attributes:"+xmlNode.attributes());
                  trace("xmlNode.attributes:"+xmlNode.nodeKind());
                  trace("xmlNode.children():"+xmlNode.children());
                  trace("xmlNode.children().length():"+xmlNode.children().length());
  
                  if(xmlNode.children().length()&gt;0){
                      var xmlNodeChildren:XMLList = xmlNode.children() as XMLList;
                      var xmlNodeFirstChild:XML = xmlNodeChildren[0];
                      trace("xmlNodeFirstChild:"+xmlNodeFirstChild);
                      trace("xmlNodeFirstChild.name():"+xmlNodeFirstChild.name());
                      trace("xmlNodeFirstChild.comments():"+xmlNodeFirstChild.comments());
                      trace("xmlNodeFirstChild.attributes():"+xmlNodeFirstChild.attributes());
                      trace("xmlNodeFirstChild.nodeKind():"+xmlNodeFirstChild.nodeKind());
                      trace("xmlNodeFirstChild.descendants():"+xmlNodeFirstChild.descendants());
                  }
  
  
              } 
  </code></pre>
  
  <p>And here is the result (console), that I just don't understand at all:</p>
  
  <pre><code>node:&lt;RequirementSet ID="BUS 2 REQ"&gt;
    &lt;Requirement ID="REQ-BUS-3.2.1" title="exigence bus3" description="blabla 321" testable="true"/&gt;
  &lt;/RequirementSet&gt;
  node.children:
  xmlNode.name:RequirementSet
  xmlNode.localName:RequirementSet
  xmlNode.attributes:BUS 2 REQ
  xmlNode.attributes:element
  xmlNode.children():
  xmlNode.children().length():1
  xmlNodeFirstChild:
  xmlNodeFirstChild.name():Requirement
  xmlNodeFirstChild.comments():
  xmlNodeFirstChild.attributes():REQ-BUS-3.2.1exigence bus3blabla 321true
  xmlNodeFirstChild.nodeKind():element
  xmlNodeFirstChild.descendants():
  </code></pre>
  
  <p>The node isn't detected by the children() method but it exists. The problem is that I can't look at the source code of XML.abc cause it isn't open-source. Can someone tell me what is happenning? Is it a bug or something else?</p>