self.connect(self.TBMatrice,SIGNAL("itemChanged(QTableWidgetItem *)"),self.itemChanged)
self.connect(self.PBrefresh,SIGNAL("clicked()"), self.afficheEntete)
self.connect(self.TBMatrice,SIGNAL("itemChanged(QTableWidgetItem *)"),self.itemChanged)
self.connect(self.PBrefresh,SIGNAL("clicked()"), self.afficheEntete)