Adobe have put together a very useful resource to help you style your flex applications.  It is simple to use, just pick the control you want to style from the panel on the left, tweak the style using the next panel along.  This will update the third panel which is a sandboxed control of the type you selected.  You can see the resulting CSS in the final panel on the right and you can export the css created via the option on the left panel.

Apparently it has been updated for Flex 3 but so far I have noticed that the css stylenames it spits out are not the same ones available in flexbuilder, but they are close and this will help you style the less obvious elements of a control.

You can get to it via this link and you should bookmark for future reference too ;0)

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