[flexcoders] Questions about DragManager

[timgerr]

Hello all, I am working on a drag and drop component and I have a few
questions if ya don't mind.

I am seeing this DragManager
(http://weblogs.macromedia.com/pent/archives/2006/11/tree_drag_and_d.html)
 and other places, so when I add it I get an error.  Here is my code:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application   xmlns:mx="http://www.adobe.com/2006/mxml";
layout="absolute">
        <mx:HTTPService id="xmlLoader"
url="http://miys02ae211935l.miys02.gd-ais.com/try/fruitDB/v1.php";
                 resultFormat="e4x" contentType="application/xml"
result="xmlReturned(event)"/>
        <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"; width="400"
height="300" left="20"
        top="10">
            <mx:Script>
                <![CDATA[
                    import mx.collections.XMLListCollection;
                    import mx.events.DragEvent;
                    import mx.core.DragSource;
        
                    [Bindable]
                    private var xmlValue:XMLListCollection;
        
                    private function xmlReturned(event:Event):void
                    {
                        xmlValue = new XMLListCollection(new
XMLList(xmlLoader.lastResult));
                    }
                                private function onDragEnter( event:DragEvent ) 
: void
                                {
                                        
DragManager.acceptDragDrop(UIComponent(event.currentTarget));
                                }
                    
        
                ]]>
            </mx:Script>
            <mx:Button click="xmlLoader.send()" label="get XML"/>
            <mx:Tree dataProvider="{xmlValue}" y="100" labelField="@label"
width="300" 
        showRoot="true"/>
        </mx:Canvas>
</mx:Application>

I get an error at the function:
private function onDragEnter( event:DragEvent ) : void
        {
          DragManager.acceptDragDrop(UIComponent(event.currentTarget));
        }
*error is "Call to a pssibly undefined method UIComponent.  I am not
sure if I have to declare DragManager????

What am I doing wrong?

Thanks for the help,
Timgerr