CodingForums.com - flex xml in tree

The following xml values is getting from php file

Code:

<result>

       <list>

          <node>air</node>

          <node>flex</node>

          <node>android</node>

       </list>

    </result>

i am calling this xml using httpservice

Code:

  <mx:HTTPService 

                        id="project" 

                url="http://localhost/eshpm/AIR/newproject.php"

                method="POST" result="onResult_projectname(event)" resultFormat="e4x">

                          <mx:request xmlns="">

                                  <name>yes</name>

                          </mx:request>

    </mx:HTTPService>

The result is obtained using the function

Code:

 private function onResult_projectname(evt:ResultEvent):void

     {

            

                  xmldata = new XML(evt.result);

            xmlList_user = new XMLListCollection(xmldata.list);                          

            

            tree.dataProvider = xmlList_user.children();                    

     }

The problem is that i am able to display the values in Tree.......but it is repeating

ie, "air" is comming in tree twice....

plz help.............thanks