Barchart wth Annotations in Flex - apache-flex

I had developed BarCharts with annotations. Each bar is a one bar chart(displaying in attached jpeg). But i need total in one barchart with 4 bar series and annotations like a black line displaying in the middle (like,as shown in attached jpeg )
Please refer the below link.
http://img256.imageshack.us/img256/4872/chartsc.jpg
Data is comming from the server and need plot into the charts, but i could not find the solution, how to do it.
Please let me know any one have solution on the same.
Thanks,
Ravi

i had changed to barchart to progressBar. so Noe this issueis tempararoly resolved. Thanks to all for spending time to see and try to resolve it.

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