Changing cursor shape

[Odyseusz]

I have a problem with cursor (Windows XP SP3, Qt 4.7.0 Creator, both debug and release variants):

I don't understand behavior of cursor in this program! When i'm clicking on window (not QLabel area) cursor changes its shape as I expected. When I press mouse button cursor changes to "ClosedHandCursor" and when I released one cursor changes to "OpenHandCursor". But if I moved cursor over QLabel area cursor changes its shape ONLY on QLabel area despite the fact that events "mousePressEvent" and "mouseReleaseEvent" are served - see window title.

Do somebody knows how solve this problem? Thank you.

----------------------------------------------------------
main.cpp
----------------------------------------------------------

#include <QApplication>
#include "Problem.h"
 
 int main(int argc, char *argv[])
{
     QApplication app(argc, argv);
     Problem win;
     win.show();
     return app.exec();
}

#include <QApplication>
#include "Problem.h"

 int main(int argc, char *argv[])
{
     QApplication app(argc, argv);
     Problem win;
     win.show();
     return app.exec();
}

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----------------------------------------------------------
problem.h
----------------------------------------------------------

#include <QWidget>
 
 class Problem : public QWidget
{
    public:
       Problem();
    protected:
       void mousePressEvent(QMouseEvent *event);
       void mouseReleaseEvent(QMouseEvent *event);
};

#include <QWidget>

 class Problem : public QWidget
{
    public:
       Problem();
    protected:
       void mousePressEvent(QMouseEvent *event);
       void mouseReleaseEvent(QMouseEvent *event);
};

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----------------------------------------------------------
problem.cpp
----------------------------------------------------------

#include <QtGui>
#include "Problem.h"
 
  Problem::Problem()
{
       setWindowTitle(" ? ");
       setGeometry(50,50,500,300);
       setCursor(Qt::OpenHandCursor);
 
       QLabel *Label = new QLabel("Label area", this);
       Label->setFrameStyle(1);
       Label->setGeometry(100,100,200,20);
}
  void Problem::mousePressEvent(QMouseEvent *event)
{
       setCursor(Qt::ClosedHandCursor);
       setWindowTitle(" ClosedHandCursor "));
}
  void Problem::mouseReleaseEvent(QMouseEvent *event)
{
       setCursor(Qt::OpenHandCursor);
       setWindowTitle(" OpenHandCursor "));
}

#include <QtGui>
#include "Problem.h"

  Problem::Problem()
{
       setWindowTitle(" ? ");
       setGeometry(50,50,500,300);
       setCursor(Qt::OpenHandCursor);

       QLabel *Label = new QLabel("Label area", this);
       Label->setFrameStyle(1);
       Label->setGeometry(100,100,200,20);
}
  void Problem::mousePressEvent(QMouseEvent *event)
{
       setCursor(Qt::ClosedHandCursor);
       setWindowTitle(" ClosedHandCursor "));
}
  void Problem::mouseReleaseEvent(QMouseEvent *event)
{
       setCursor(Qt::OpenHandCursor);
       setWindowTitle(" OpenHandCursor "));
}

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