I have tried hard to add a group box to the following set of widgets but failed, can someone point out a mistake!!

Qt Code: 
  1. QLabel *labelSA = new QLabel("Self Analysis Tools");
  2. 		QComboBox *comboBoxSA = new QComboBox(this);
  3. // code
  4. 		QLabel *labelST = new QLabel("Slope Threshold for Feature Peeling");
  5. 		QSlider *sliderST = new QSlider(Qt::Horizontal);
  6. // code
  7. 		QLabel *labelMDFP = new QLabel("Min diff for FP b/w local min and local max");
  8. 		QSlider *sliderMDFP = new QSlider(Qt::Horizontal);
  9. // code
  10. 		QLabel *labelID = new QLabel("Inter-DS Analysis");
  11. 		QComboBox *comboBoxID = new QComboBox(this);
  12. // code
  13. 		QLabel *labelCT = new QLabel("Clamp Threshold for Inter-DS width difference");
  14. 		QSlider *sliderCT = new QSlider(Qt::Horizontal);
  15. // code
  16. 		QLabel *labelZI = new QLabel("Zoom In/Out from CT Dataset");
  17. 		QPushButton *buttonRC = new QPushButton("Reset Control Points");
  18. // code
  19. 		QPushButton *buttonZI = new QPushButton("Zoom In/Out");
  20. // code
  21.  
  22. // a group box starting here
  23.  
  24. 		QVBoxLayout *vbox0 = new QVBoxLayout;
  25. 		vbox0->addWidget(labelSA, 0, Qt::AlignTop);
  26. 		vbox0->addWidget(comboBoxSA, 0, Qt::AlignTop);
  27. 		vbox0->addWidget(labelST, 0, Qt::AlignTop);
  28. 		vbox0->addWidget(sliderST, 0, Qt::AlignTop);
  29. 		vbox0->addWidget(labelMDFP, 0, Qt::AlignTop);
  30. 		vbox0->addWidget(sliderMDFP, 0, Qt::AlignTop);
  31. // a group box starting here
  32. 		vbox0->addWidget(labelID, 0, Qt::AlignTop);
  33. 		vbox0->addWidget(comboBoxID, 0, Qt::AlignTop);
  34. 		vbox0->addWidget(labelCT, 0, Qt::AlignTop);
  35. 		vbox0->addWidget(sliderCT, 0, Qt::AlignTop);
  36. // a group box starting here
  37. 		vbox0->addWidget(labelZI, 0, Qt::AlignTop);
  38. 		vbox0->addWidget(buttonRC, 0, Qt::AlignTop);
  39. 		vbox0->addWidget(buttonZI, 0, Qt::AlignTop);
  40. 		vbox0->addStretch(1);
  41.  
  42. 		QWidget *toolpage0 = new QWidget;
  43. 		toolpage0->setLayout(vbox0);
  44.  
  45. 		toolbox->addItem(toolpage0, "Automatic Analysis of Datasets");
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i tried to get help from the QT assistant but i get a run time error at the last line it seems as if i cannot have a group box and toolpage at the same time.

help needed