code: 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)
docs: Create dialog button box and add it to the dialog layout