[PyQt] isColumnHidden problem

[Kermit]

hi all,
i've a problem with isColumnHidden

    def __setupContextMenu(self):

 self.treeView_societe.header().setContextMenuPolicy(Qt.CustomContextMenu)
        self.__menu = QMenu(self)
        for a in range(len(TabSoc)):
                act = QAction(TabSoc[a], self)
                act.setCheckable(True)
                act.setChecked(not self.treeView_societe.isColumnHidden(a))
                act.setData(QVariant(a))
                self.__menu.addAction(act)

        self.connect(self.treeView_societe.header(),
SIGNAL('customContextMenuRequested(const QPoint &)'),self.__showContextMenu)
        self.connect(self.__menu, SIGNAL('triggered(QAction
*)'),self.__ColumnHidden)

in this code self.treeView_societe.isColumnHidden(a) return always false


for information, treeView_societe is my own class :
class SocieteTree(QTreeView):
    def __init__(self, parent = None):
        print "debut init SocieteTree"
        QTreeView.__init__(self, parent)
        self.setObjectName("SocieteListing")

where is my mistake ?

thx for your help

Kermit
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