Impossible to get correct widget background color

[croscato]

I tryed base() too with no success.

My widget is a sub-class of QPushButton, like this:

class QIscButton: public QPushButton

class QIscButton: public QPushButton

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I don't know if it's relevante but I'm using Slackware 12.2, with KDE 4.2.3 and the Qt version is 4.5.1.

Thanks.