Help with displaying data in advanceddatagrid

Hi,
I am working on flex 4.5.0 with java 5 as back end using blazeds.
I've to display nested data in advanceddatagrid.
Complex Person -> Person
From the backend i am sending an ArrayList of ComplexPerson which consists of Person Object as well.
code snippet is as follows
ComplexPerson complexPerson = new ComplexPerson(person);
complexPerson.setUser(person.getUser());
complexPersonList.add(complexPerson);
return complexPersonList;
When i access the ArrayList on the Flex end I am able to print the number of elements in the ArrayList but when i try to print the elements within the ArrayList I get following error
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at net.sf.gilead.pojo.actionscript::LightEntity/toString()[C:\eclipse\workspace\gilead\gilea d\trunk\adapter-actionscript\src\net\sf\gilead\pojo\actionscript\LightEntity.as:55].
So my question is
1. how do i set a parent-child relationship between ComplexPerson and Person Object. whether i should do it java by passing some property or is there any functionality available in flex.
2. I dont want to pass an XML from java to flex as i am using remote object.
Could anyone please suggest what is the best way to do this?
Thanks in advance.
Shuja.

Formated post here:
http://forum.java.sun.com/thread.jspa?threadID=641779

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