How to add QButtongroup to Layout?

Originally I had two QRadioButtons withing Layout which in the end were no exclusive. Therefore I try to add them to a QButtonGroup. Unfortinately I could find no example or these were for Qt3.

If there is a possibility to do all this mainly within the designer that would be great, but I dont know how. So in case please let me know.

This is what I coded so far. But in the end it fails because the QButtonGroup is no widget and I have no idea to add it to the layout.

Code:

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radioButtonNoFFT = new QRadioButton(this);
    radioButtonNoFFT->setObjectName(QString::fromUtf8("radioButtonNoFFT"));
    radioButtonNoFFT->setChecked(true);  
 
    radioButtonFFT = new QRadioButton(this);
    radioButtonFFT->setObjectName(QString::fromUtf8("radioButtonFFT"));
 
	buttongroup = new QButtonGroup(this);
	buttongroup->addButton(radioButtonNoFFT);
	buttongroup->addButton(radioButtonFFT);
 
	gridLayoutButtonGroup = new QGridLayout(this);
    gridLayoutButtonGroup->setObjectName(QString::fromUtf8("gridLayoutButtonGroup"));
	gridLayoutButtonGroup->addWidget(buttongroup);
 
    gridLayout->addLayout(gridLayoutButtonGroup, 1, 0, 1, 1);

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In the end I now found out that this is everthiny I need to do:

Code:

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setupUi(this);
 
	buttongroup = new QButtonGroup(this);
	buttongroup->addButton(radioButtonNoFFT);
	buttongroup->addButton(radioButtonFFT);

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finding this out however caused me about 2 hours of trying to find some code example and implement whatever I could find...