How do i Drag and drop From one tree to another and vise versa?

Question

I have two tree structures and i'm trying to drag a leaf of a branch from one tree to another and vise versa. i'm using flex 3 to code it. I'm also trying to put a prevention on dropping a leaf of one tree from being dropped inside a branch of another tree. Anything that is dragged over to another tree should be placed as a dangling node in that tree. Please share this code and help me find a solution.
<?xml version="1.0" encoding="utf-8"?><mx:Application 
xmlns:mx="
http://www.adobe.com/2006/mxml" xmlns:comp="
com.adobe.flex.extras.controls.*" initialize="data2
new
ArrayCollection(countries);"layout="
absolute"verticalAlign="
middle" backgroundColor="white" height="
551">
<mx:Script>
<![CDATA[
importmx.events.FlexEvent; 
importmx.collections.ArrayCollection; 
importmx.controls.Alert; 
importmx.events.DragEvent; 
importmx.managers.DragManager;  
importmx.core.DragSource;  
importmx.core.UIComponent;  
importmx.controls.Tree;  
// data provider for role name[
Bindable] private vardata2: ArrayCollection; 
// variable to store the node that is dragged from a tree 
private var draggedItemOfAccessTree:XML = null;  
private var draggedItemOfExclusionTree:XML = null; 
private var dragItemAccess:DisplayObject =null; 
private var dragItemExclusion:DisplayObject =null; 
// Array to store the Role list[
Bindable]public varcountries: Array = [{id: 0, name:
"Role 1"},{id: 1, name:
"Role 2"},{id: 2, name:
"Role 3"},{id: 3, name:
"Role 4"},{id: 4, name:
"Role 5"},{id: 5, name:
"Role 6"},{id: 6, name:
"Role 7"},{id: 7, name:
"Role 8"},{id: 8, name:
"Role 9"},{id: 9, name:
"Role 10"},{id: 10,name:
"Role 11"} 
// this event is called when we begin dragging a node in a tree 
private function onAccessListDragEnter( event:DragEvent ) : void{
event.preventDefault();
vards1:DragSource = event.dragSource;  
var items1:Array = ds1.dataForFormat("treeItems") asArray; 
if (items1 != null && items1.length > 0 && (items1[0] isXML)){
draggedItemOfAccessTree = items1[0];
dragItemAccess = items1[0]
asDisplayObject;}
DragManager.acceptDragDrop(UIComponent(event.currentTarget));
private function onExclusionListDragEnter( event:DragEvent ) : void{
event.preventDefault();
vards2:DragSource = event.dragSource;  
var items2:Array = ds2.dataForFormat("treeItems") asArray; 
if (items2 != null && items2.length > 0 && (items2[0] isXML)){
draggedItemOfExclusionTree = items2[0];
dragItemExclusion =items2[0]
asDisplayObject;}
DragManager.acceptDragDrop(UIComponent(event.currentTarget));
private function onAccessListDragOver( event:DragEvent ) : void{
event.preventDefault();
varvar1:Number = AccessTree.selectedIndex; 
varvar2:Number = ExclusionTree.calculateDropIndex(event);  
var node1:XML = AccessTree.selectedItem asXML;  
var node2:XML = ExclusionTree.calculateDropIndex(event) asXML;  
//restrict drag & drop to nodes within same parent  
if(draggedItemOfAccessTree.parent() == node1.parent() || draggedItemOfAccessTree.parent() != node1.parent()){
DragManager.showFeedback(DragManager.NONE);
//return; }
elseDragManager.showFeedback(DragManager.MOVE);
private function onExclusionListDragOver( event:DragEvent ) : void{
event.preventDefault();
varvar1:Number = ExclusionTree.selectedIndex;  
varvar2:Number = AccessTree.calculateDropIndex(event); 
var node1:XML = AccessTree.calculateDropIndex(event) asXML;  
var node2:XML = ExclusionTree.selectedItem asXML;  
//restrict drag & drop to nodes within same parent  
if( draggedItemOfExclusionTree.parent() == node2.parent() || draggedItemOfExclusionTree.parent() != node2.parent()){
DragManager.showFeedback(DragManager.NONE);
// return; }
elseDragManager.showFeedback(DragManager.MOVE);
private function onAccessListDragDrop( event:DragEvent ) : void{
event.preventDefault();
varSindex:Number = AccessTree.selectedIndex; 
varEindex:Number= ExclusionTree.calculateDropIndex(event);  
var Enode:XML = ExclusionTree.selectedItem asXML;  
var Anode:XML = AccessTree.selectedItem asXML; 
if((draggedItemOfAccessTree.parent() != Anode.parent()) ){
AccessTree.removeChildAt(Sindex);
ExclusionTree.addChildAt(dragItemAccess , Eindex);
// AccessTree.rdataDescriptor.removeChildAt(Anode.parent(),draggedItemOfAccessTree,Sindex);  
//ExclusionTree.dataDescriptor.addChildAt(Enode.parent(),draggedItemOfAccessTree,Eindex); }
private function onExclusionListDragDrop( event:DragEvent ) : void{
event.preventDefault();
varEindex:Number = ExclusionTree.selectedIndex; 
varSindex:Number = AccessTree.calculateDropIndex(event);  
var Anode:XML = AccessTree.selectedItem asXML;  
var Enode:XML = ExclusionTree.selectedItem asXML; 
if((draggedItemOfExclusionTree.parent() != Enode.parent()) ){
ExclusionTree.removeChildAt(Eindex);
AccessTree.addChildAt(dragItemExclusion, Sindex);
// ExclusionTree.dataDescriptor.removeChildAt(Enode.parent(),draggedItemOfExclusionTree,Eind ex);  
// AccessTree.dataDescriptor.addChildAt(Anode.parent(),draggedItemOfExclusionTree,Eindex); }
private function onDragComplete( event:DragEvent ) : void

Answer 1

Yes, I have set dragEnabled and dropEnabled to true. I trying to put restriction on dropping the node(aka leaf) of 1st free tree inside the branch(aka folder) of the 2nd tree. If something is dragged from tree1, it should be dropped only on tree2  i.e., dragged node should be appended at the end of tree2 and not inside nay of the branches of tree2. This functionality should work on both the trees. I'll be glad if u can provide the solution.