[Qt4.5] event(QEvent * event) freeze application

[czlowiekcien]

when I try to use event it freeze everything
*.h

#include <QtGui/QWidget>
 
 
namespace Ui
{
    class Widget;
 
}
class Widget : public QWidget
{
    Q_OBJECT
protected:
  virtual bool event(QEvent * event);
public:
    Widget(QWidget *parent = 0);
    ~Widget();
 
public slots:
 
private:
    Ui::Widget *ui;
 
};

#include <QtGui/QWidget>


namespace Ui
{
    class Widget;

}
class Widget : public QWidget
{
    Q_OBJECT
protected:
  virtual bool event(QEvent * event);
public:
    Widget(QWidget *parent = 0);
    ~Widget();

public slots:
   
private:
    Ui::Widget *ui;

};

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*.cpp

bool Widget::event(QEvent * event)
    {event->accept();
    if(event->type()==QEvent::Enter)
            {
            ui->label_2->setText("QEvent::Enter");
            }
    return true;
    }

bool Widget::event(QEvent * event)
    {event->accept();
    if(event->type()==QEvent::Enter)
            {
            ui->label_2->setText("QEvent::Enter");
            }
    return true;
    }

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it looks like it is working but only some miliseconds and stops. label_2 had write only half of text "QEvent::E"