Thanks for advice but it doesn't work. My index is OK, tried it. I don't know what I am doing wrong. Here is my Platform class which inherits widget
Qt Code: 
  1. class Platform : public QWidget
  2. {
  3. 	Q_OBJECT
  4. public:
  5.         QLabel * labelPlatformType;
  6.         QLineEdit * editPlatformType;  
  7. 	QLabel * labelActivatedStatus;
  8. 	QLineEdit * editActivatedStatus;
  9. 	QLabel * platformOS;
  10. 	QLineEdit * editPlatformOS;
  11. 	QLabel * timeout;
  12. 	QLineEdit * editTimeout;	
  13.  
  14. 	Platform( QWidget *parent = 0);
  15. 	virtual ~Platform();
  16. };
  17.  
  18. //this is constructor
  19.  
  20. Platform::Platform(QWidget *parent): QWidget(parent)
  21. {
  22. 	labelPlatformType= new QLabel(tr("Platform Type :"));
  23. 	labelPlatformType->setParent(parent);
  24. 	labelPlatformType->setGeometry(QRect(20, 30, 80, 18));
  25. 	editPlatformType= new QLineEdit(parent);	
  26. 	editPlatformType->setGeometry(QRect(100, 30, 113, 18));	
  27. 	labelActivatedStatus= new QLabel(tr("Activated Status :"));
  28. 	labelActivatedStatus->setParent(parent);
  29. 	labelActivatedStatus->setGeometry(QRect(20, 50, 100, 18));
  30. 	editActivatedStatus= new QLineEdit(parent);
  31. 	editActivatedStatus->setGeometry(QRect(130, 50, 81, 18));
  32. 	platformOS= new QLabel(tr("Platform OS :"));
  33. 	platformOS->setParent(parent);
  34. 	platformOS->setGeometry(QRect(250, 30, 100, 18));
  35. 	editPlatformOS= new QLineEdit(parent);
  36. 	editPlatformOS->setGeometry(QRect(332, 30, 91, 18));
  37. 	timeout= new QLabel(tr("Timeout :"));
  38. 	timeout->setParent(parent);
  39. 	timeout->setGeometry(QRect(250, 50, 100, 18));
  40. 	editTimeout= new QLineEdit(parent);
  41. 	editTimeout->setGeometry(QRect(310, 50, 113, 18));
  42. }
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Maybe you got some new ideas? I don't know whats wrong here