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I played around with skinning a few months ago too but I didn't run over this problem. Check this article: http://www.adobe.com/devnet/flex/articles/flex_skins.html I don't know how are you replacing the default icons but what I did, was to build my skins from scratch with the help of the template of Flex skins for Photoshop, saved each skin as a .png file and everything worked fine.
With best regards,
Thanks for your reply.
As far as I know, reason for my question is that I add icons to default Button style, and those inherited from Button has that icon too. If I add images, they won't. Maybe I didn't pay attention on these two different things.
Are you sure what you replaced is icon, but not image?