Background becomes black when defining depthColors style for Tree Component.
It used to work fine before (in Flex 2.0). Now with Flex 2.0.1, it renders as shown below when we define depthColors attribute for Tree Component
depthColors="[0xFFFFFF, 0xF2F6F7, 0xEDF5F7, 0xE8F0F2, 0xD3E2E6]"
If I find any workaround I will update this post. If you know a workaround please post it as a comment