Can't add QButtonGroup to QGridLayout

[migel]

gridLayout = new QGridLayout;
QButtonGroup *delGroup = new QButtonGroup();
gridLayout->addWidget(delGroup,1 , 0, 1, 2, Qt::AlignRight);

gridLayout = new QGridLayout;
QButtonGroup *delGroup = new QButtonGroup();
gridLayout->addWidget(delGroup,1 , 0, 1, 2, Qt::AlignRight);

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ERROR:
error: no matching function for call to 'QGridLayout::addWidget(QButtonGroup*&, int, int, int, int, Qt::AlignmentFlag)'

QGridLayout does not inherit to widget so how do I add it to ?