<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
                                 xmlns:s="library://ns.adobe.com/flex/spark" 
                                 xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
          <fx:Script>
                    <![CDATA[
                              import mx.core.DragSource;
                              import mx.events.DragEvent;
                              import mx.managers.DragManager;
 
                              protected function group1_dragDropHandler(event:DragEvent):void
                              {
                                        trace("worked!!!")
                              }
 
                              protected function image1_mouseDownHandler(event:MouseEvent):void
                              {
                                        DragManager.doDrag(event.currentTarget,new DragSource,event);
                              }
 
                              protected function group1_dragEnterHandler(event:DragEvent):void
                              {
                                        DragManager.acceptDragDrop(event.dragInitiator);
                              }
 
                    ]]>
          </fx:Script>
          <s:Group dragDrop="group1_dragDropHandler(event)" dragEnter="group1_dragEnterHandler(event)" width="100" height="100">
                    <s:Rect width="100%" height="100%">
                              <s:fill>
                                        <s:SolidColor color="0" />
                              </s:fill>
                    </s:Rect>
          </s:Group>
          <s:Image x="300" y="300" source="test.jpg" mouseDown="image1_mouseDownHandler(event)" />
</s:Application>
 

here is my app code,my amigo,i dunno why Group cant capture dragdrop event,do u know?

=============================================================

so stupid i am!

DragManager.acceptDragDrop(event.dragInitiator);

it's wrong.it should be like this

DragManager.acceptDragDrop(event.target);

then everything is ok now