Coloring checkable QPushbutton with style sheet

[RThaden]

Try the following:

Open the designer, pull a Pushbutton on an empty widget, make it checkable and give it the following style sheet

QPushButton {background-color: green;} 
QPushButton:checked{background-color: red;}

QPushButton {background-color: green;} 
QPushButton:checked{background-color: red;}

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This should make the unchecked button green and the checked button red.
However, what happens is:
It's green when unchecked
It's lightgray when checked
It's red whil you keep it pressed when it is in the checked state.

What am I missing. The documentation says "Checkable QPushButton have the :checked pseudo state set. "

I am using XP and Vista (happens in both) and Qt 4.3.2

Regards,

Rainer