QDialogButtonBox ResetRole

[mero]

I have QDialogButtonBox with "Reset" "OK" and "Close"
To OK and Close I use:

QObject::connect(ui.buttonBox, SIGNAL(accepted()), this, SLOT(button_ok()));
QObject::connect(ui.buttonBox, SIGNAL(rejected()), this, SLOT(button_close()));

QObject::connect(ui.buttonBox, SIGNAL(accepted()), this, SLOT(button_ok()));
QObject::connect(ui.buttonBox, SIGNAL(rejected()), this, SLOT(button_close()));

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How write code to Reset button ? I don't find any examples for ResetRole ...