[flexcoders] My itemrenderer is mercurial!!

[j2me_soul]

The itemrenderer is a HBox. There is a check and a label in the HBox.
When I selected any of the checkbox and scrolled the scrollbar of the List 
which used the itemrenderer, the stange thing happened, the selected checkbox 
is no longer the same checkbox !! Maybe the last one, maybe the second one ~~~  
How can I fix this ?