QWizardPage::nextId() is not called

[big_buka]

Hello,
I use QWizard to process some non-linear wizard-like operation and faced with problem. QWiardPage::nextId() is not called at all. I puted QMessageBox::information call into nextId and there is no messagebox apeared.
Also tried to compile LicenseWizard example and it also show the same page if i select any check box.
Could any one provide any solution?
I use Qt 4.8.5