//! [0]
class MyGroupBoxWidget (QStyleOptionGroupBox):
    # ...
    def initStyleOption(option):
        QGraphicsWidget.initStyleOption(self, option)
        if isinstance(option, QStyleOptionGroupBox):
            # Add group box specific state.
            box.flat = isFlat()
            # ...
//! [0]


//! [1]
setTabOrder(a, b) # a to b
setTabOrder(b, c) # a to b to c
setTabOrder(c, d) # a to b to c to d
//! [1]


//! [2]
# WRONG
setTabOrder(c, d) # c to d
setTabOrder(a, b) # a to b AND c to d
setTabOrder(b, c) # a to b to c, but not c to d
//! [2]