LineChart with a two color LineSeries how to?

Hello
Currently I am building a Flex Chart that shows the Stock Price of a Stock. Now my customer asked if it was possible to have a single LineChart with one horizontal Line that shows the closing price of the previous day and a two color Line that shows the stock price of the current day.
He would like the Line to be green when it is above the closing price Line and red when it is below the closing price Line.
Can someone tell me how to do this?
All help is appreciated!

Hello
And how can I do this by extending the LineChart?

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