How can I registed field in QWizard, which designed in QtCreator?

[syjgin]

I`m create QWizard and add several pages to it with QtCreator(built-in Qt Designer). I want to make some fields to be mandatory in constructor of QWizard, like this:

this->page(0)->registerField("name*",m_ui->lname);

this->page(0)->registerField("name*",m_ui->lname);

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but this method of QWizardPage is protected. I can`t find constructor of QWizardPages, which has been added to .ui file in graphical mode