Thank you very much @ChrisW67 !!!

Just to save some little debugging to the future,
here is tested code fore someone else just to copy & paste.

wizadr.h
Qt Code: 
  1. #include <QWizard>
  2.  
  3. namespace Ui {
  4. class Widget;
  5. }
  6.  
  7. class Wizard : public QWizard
  8. {
  9.     Q_OBJECT
  10.  
  11. public:
  12.     explicit Wizard(QWidget *parent = 0);
  13.     ~Wizard();
  14.  
  15. private:
  16.     Ui::Widget *ui;
  17. };
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wizard.cpp
Qt Code: 
  1. #include "wizard.h"
  2. #include "ui_wizard.h"
  3.  
  4. Wizard::Wizard(QWidget *parent) :
  5.     QWizard(parent),
  6.     ui(new Ui::Widget)
  7. {
  8.     ui->setupUi(this);
  9. }
  10.  
  11. Wizard::~Wizard()
  12. {
  13.     delete ui;
  14. }
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Thanks again everyone for help.