<?xml version="1.0" encoding="utf-8"?>
  <mx:Module 
          xmlns:mx="http://www.adobe.com/2006/mxml" 
          layout="absolute"
          backgroundColor="#ffffff"
          creationComplete="initApp()"
          >
  
          <mx:Script>
                  <![CDATA[
                          import com.adobe.utils.XMLUtil;                
  
                          private var myXML:XML = XML(
                                  "<node>"+
                                          "<node label=\"group1\">"+
                                                  "<node label=\"user1\"/>"+
                                                  "<node label=\"user2\"/>"+
                                                  "<node label=\"user3\"/>"+
                                          "</node>"+
                                          "<node label=\"group2\"/>"+
                                          "<node label=\"group3\"/>"+
                                  "</node>"
                          );
                          
                          private function initApp():void
                          {
                                  resetXML();
                          }
  
                          private function onXMLTextChange(event:Event):void
                          {
                                  if(XMLUtil.isValidXML(xmlText.text))
                                  {
                                          xmlTree.dataProvider = XML(xmlText.text).children();
                                  }
                                  else
                                  {
                                          xmlTree.dataProvider = null;
                                  }
                          }
                          
                          private function resetXML():void
                          {
                                  xmlText.text = myXML.toString();
                                  xmlTree.dataProvider = XML(xmlText.text).children();
                          }
                          
                  ]]>
          </mx:Script>
          
          <mx:HBox width="100%" height="100%">
                  <mx:TextArea id="xmlText" width="100%" height="100%" change="onXMLTextChange(event)"/>                                
                  <mx:Tree selectedIndex="0" id="xmlTree" width="100%" height="100%" labelField="@label"/>                
                  <mx:VBox width="100%" height="100%">
                          <mx:Text text="isValidXML:{ XMLUtil.isValidXML(xmlText.text) }"/>
                          <mx:Button label="reset" click="resetXML()"/>                        
                          <mx:Text text="getPreviousSibling:{ '\n'+XMLUtil.getPreviousSibling(XML(xmlTree.selectedItem)).toXMLString() }"/>
                          <mx:Text text="current element:{'\n'+xmlTree.selectedItem.toXMLString()}"/>                        
                          <mx:Text text="getNextSibling:{'\n'+XMLUtil.getNextSibling(XML(xmlTree.selectedItem)).toXMLString()}"/>                                                
                  </mx:VBox>
          </mx:HBox>
  </mx:Module>