按下葫芦起了瓢

if (changeElementValueButton==nullptr)
    {
        changeElementValueButton = new QPushButton;
        changeElementValueButton->setMaximumWidth(22);
        changeElementValueButton->setFixedWidth(22);

        connect(changeElementValueButton,SIGNAL(clicked()),this,SLOT(OnSelectDataButtonClick()));

        advancePropertyQTableWidget->setCellWidget(0, 2, changeElementValueButton);
    }