QDialogButtonBox buttons size

[hulud]

In my program i am dinamically inserting buttons into a QDialogButtonBox, but i want them to be really big.
No matter what i try to do, they are always standard size.
can someone point me to a correct stylesheet or anything to achive that?

right now i'm inserting new buttons like that:

ui->buttonBox->addButton("OK", QDialogButtonBox::AcceptRole);
ui->buttonBox->addButton("Yes", QDialogButtonBox::YesRole);
ui->buttonBox->addButton("No", QDialogButtonBox::NoRole);

ui->buttonBox->addButton("OK", QDialogButtonBox::AcceptRole);
ui->buttonBox->addButton("Yes", QDialogButtonBox::YesRole);
ui->buttonBox->addButton("No", QDialogButtonBox::NoRole);

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