[flexcoders] ItemRenderer issue

[j2me_soul]

I use the spark list component.I want to set the itemrenderer to the default 
state when the new data is coming.
I try to write the code in the createComplete handler but it only excute one 
time !
And I try to write the same code in the addedToStage and added event handlers
but the result is same ~~
 
Which is event should I listen to init the itemrenderer ? Or how to recreate 
itemrenderer when new data is coming ?