How to add space b/w column and rows of gridlayout.

[Niamita]

Hi
I am trying to add space b/w rows and column of gridlayout but it is not working.
I have 2*2 gridlayout like the following

QGridLayout *layout = new QGridLayout;
    layout->setAlignment(Qt::AlignCenter);
 
        layout->addWidget(button_panic, 0, 0);
        layout->setHorizontalSpacing(5);
        layout->addWidget(button_gas, 0, 1);
        layout->setVerticalSpacing(5);
        layout->addWidget(button_alarm, 2, 0);
        layout->setHorizontalSpacing(5);
        layout->addWidget(button_fire, 2, 1);
        this->setLayout(layout);

QGridLayout *layout = new QGridLayout;
    layout->setAlignment(Qt::AlignCenter);

        layout->addWidget(button_panic, 0, 0);
        layout->setHorizontalSpacing(5);
        layout->addWidget(button_gas, 0, 1);
        layout->setVerticalSpacing(5);
        layout->addWidget(button_alarm, 2, 0);
        layout->setHorizontalSpacing(5);
        layout->addWidget(button_fire, 2, 1);
        this->setLayout(layout);

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How to add space b/w widgeta laid in layout.