Adavnced Datagrid: How to access hierarical data from the renderer

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i have advanced data grid hierarical data , renderer spans row when the heirrical arrow icon clicked. want access level 1 of data within renderer set data in ui elements. please let me knwo how this.

 

my data looks the  following :

 

 

private var dphierarchy:arraycollection= new arraycollection([
                {type:"unassigned", date:11-21-2009, payee: "creditcard debit 328", payment:70, deposit:0,accout:"my visa", envelope:"my envelope", children:[ 
                    {checkno:"unassigned",note:11-21-2009}]}

 

]);



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