'Create dialog button box and add it to the dialog layout'

def add_button_box(self, stdbtns):

    bbox = QDialogButtonBox(stdbtns)
    run_btn = bbox.addButton(_('Run'), QDialogButtonBox.AcceptRole)
    run_btn.clicked.connect(self.run_btn_clicked)
    bbox.accepted.connect(self.accept)
    bbox.rejected.connect(self.reject)
    btnlayout = QHBoxLayout()
    btnlayout.addStretch(1)
    btnlayout.addWidget(bbox)
    self.layout().addLayout(btnlayout)
