Good morning, sehr geheerte Damen und Herren!

I have problem I cannot crack. I have three classes, that need to cooperate. Namely, I am writing language change aware app and I coded a class, derived from QPushButton, which represent a "nation flag button". It is subclassed from QPushButton and also it holds a private member:
Qt Code: 
  1. private:
  2.     qint16 m_iLanguageId;    // language id number
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which is id number from database. When creating an object from CFlagButton, this number is set correctly. But I simply cannot send this number via signal mapper i wrote to its parent window, CLanguageSelectorWidget, which holds more of CFlagButtons (for every langauge in database there is appropriate flag button). Here is signal mapper I wrote:
Qt Code: 
  1. CFlagButton::CFlagButton(QWidget* pParent,
  2.                          const QString flagPicture,
  3.                          const QString flagCaption,
  4.                          bool captionShown,
  5.                          const QString langTranslator,
  6.                          const qint16 iLanguageIdentificator)
  7. {
  8.     ....
  9.     m_pFlagButtonSM=new QSignalMapper(this);    // creates new signal mapper
  10.     Q_CHECK_PTR(m_pFlagButtonSM);    // checks creation
  11.     // installation of translator
  12.     m_pTranslator=new QTranslator(qApp);    // creats new translator
  13.     Q_CHECK_PTR(m_pTranslator);    // checks creation
  14.     m_pTranslator->load(langTranslator);    // loads translator
  15.     connect(this,
  16.             SIGNAL(clicked()),
  17.             m_pFlagButtonSM,
  18.             SLOT(map()));    // connects button to signal mapper
  19.     m_pFlagButtonSM->setMapping(this, (int)m_iLanguageId);    // sets mapping
  20. /*
  21.     connect(m_pFlagButtonSM,
  22.             SIGNAL(mapped(int)),
  23.             this,
  24.             SIGNAL(clicked(const int)));    // connects signal mapper to button
  25.     connect(this, SIGNAL(clicked(const int)),
  26.             pParent, SLOT(translate(const int)));    // connects emited signal to slot
  27. */
  28.     connect(m_pFlagButtonSM,
  29.             SIGNAL(mapped(int)),
  30.             pParent,
  31.             SLOT(translate(const int)));    // connects signal mapper to translator
  32.     ....
  33. }
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pParent here is CLanguageSelectorWidget object and its translate() slot is:
Qt Code: 
  1. void CLanguageSelectorWidget::translate(const int iLanguageIdentificator)
  2. {
  3.     qDebug() << "iLanguageIdentificator: " << iLanguageIdentificator;
  4.     qApp->installTranslator(m_LangButtonGroup.at(iLanguageIdentificator-1)->translator());    // installs translator
  5.     accept();    // closes parent window
  6. }
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m_LangButton group is defined as:
Qt Code: 
  1. QList<QPointer<CFlagButton> > m_LangButtonGroup;    // language button group
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I've entered into debugger, set the breakpoints and the cruical member variable m_iLanguageId holds -4096 or -4098 values (it seems it is not initialized properly)
In constructor of CFlagButton the variable is initalized properly - checked with gdb.
Can nice jpn or other nice experts help me?