Subclassing default style

[thru]

I want to make minor changes to some of the default pixelMetrics in the active style, for example changing the PM_SmallIconSize.
I understand that the proper way would be subclassing the style but that would imply knoing previously the default style active on the particular platform the program runs.

What would be a clean/simple way to do that ?

thanks!

[javimoya]

solution here:
http://developer.qt.nokia.com/faq/an..._change_a_smal

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Added after 7 minutes:

since qt 4.6 a better and easier solution:
QProxyStyle