[flexcoders] Flex 4.5 - Cell background color in datagrid

[isa_loyer]

Hi,
 
I load some data with httpservice.
In those data, I have a backgound color for each cell.
Can you explain how to do to change background color accordind data in 
dataprovider?
I thinks I must use itemrender but I don't found how to use dataprovider data 
to do that.
 
Thaks for helping.