Adding BackGroundImage to RootNode of FLEX Tree Component

Hi All,
        I am working with Flex Tree component, I have a requirement of adding background image for the root nodes. Right now i am using the css property, depthColors:
#e2e2e2, #000000, #ffffff, #ffffff; but it is not enough.Also i tried adding the image as the child using createchildren() method, but the image is replacing the root node text, efforts that i put went as vain. Kindly help me out in adding image as the BackGround for the root nodes...

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Apache Flex

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