How to control each node mx:tree

Hello all,
I use an mx:tree. The issue is that I wantto control each node for creating lazy load mode tree. I want to see node as an clickable node which has children. But I'll call and add the childrens to dprovider when I need it, on click itemOpen event.The mx:tree watches dataprovider so show us the node if has children or not.If a node hasn't children in dataprovider, it will seem like an item,not a bin with itemOpen event.
Can you suggest me to fix this problem ?
footnote: Each node Object has Type property if it's Bin or Video etc. I want eachone if object.Type==bin, show me a bin with itemOpen event.
It's called Disclosure Triangle, yeah, that I want to control this guy
Thanks in advance

DefaultDataDescriptor class is defined for mx:tree as default descriptor. You may manipulate it by creating your customDataDescriptor class and you can override isBranch , hasChildren and getChildren functions.
For more details read about DefaultDataDescriptor class from http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/controls/treeClasses /DefaultDataDescriptor.html .

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Hi ,
I am trying to do the job , but i do not understand where
is the problem with my loop , i am sending it , could you
see it , and sujjest me , what to do. or if you have time
can you write the code for me. as i am very much needy for
this job.
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CREATE TABLE TREE_01(
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OWN_CODE VARCHAR2(10),
PARENT_NO NUMBER(10),
PARENT_CODE VARCHAR2(10),
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INSERT INTO TREE_01 VALUES(2,'2',0,'0',2,8540);
INSERT INTO TREE_01 VALUES(3,'3',0,'0',2,8540);
INSERT INTO TREE_01 VALUES(4,'4',0,'0',2,8540);
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INSERT INTO TREE_01 VALUES(6,'2',1,'0',3,8540);
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the loop shoud look like
|_DataProcessing
| |+Work_orders
| |_Programmers File
| | |_James
| | | |+Requests
| | | |+Leves
| | | |_Projects
| | | |_Projects001
| | |+Steven
|+HealthCare
|+Transportation
So the loop should be such that it can be go to any level of any node.
the Code i writter is As follows.
The Following Procedure is called in form leve
When new forms instance.
PROCEDURE REFRESH_TREE2 IS
CURSOR CUR_DEPT IS
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     FROM TREE_01 GROUP BY DEPT;
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     DEPT ,
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     SELECT RECORD_NO,
     OWN_CODE,
     PARENT_NO,
     DEPT ,
     PARENT_CODE,
     LEVELL
     FROM TREE_01
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     V_CHANGE_VALUE1 NUMBER(3);
     V_CHANGE_VALUE2 NUMBER(3);
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delete_group(RG_DEPT);
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