Dear Friends,
I am experiencing the following problem when i try to use nested QDialog. i had used .exec() to show those dialogs as modal. when i closed the second one, the first also comes out of the eventloop can any body help me to sort out this error.?

Qt Code: 
  1. //**************slot to call dialog1**************************//
  2.  
  3. void SettingWnd::Slot_showDialog()
  4. {
  5.     setEnabled(false);
  6.     setVisible(false);
  7.  
  8.     dialog1 *dialogobj = new dialog1;
  9.     dialogobj->exec();
  10.  
  11.     setVisible(true);
  12.     setEnabled(true);
  13.     btnDialup_setting->setFocus();
  14. }
  15.  
  16. //**************Dialog 1**************************//
  17.  
  18.  
  19. dialog1::dialog1(QWidget *parent) :
  20.     QDialog(parent),
  21.     ui(new Ui::dialog1)
  22. {
  23.     ui->setupUi(this);
  24.     setParent(MdiArea);
  25.     setWindowTitle("Dialog1");
  26.     setWindowFlags(Qt::FramelessWindowHint);
  27.     setFocusPolicy(Qt::NoFocus);
  28.     if(ui->listWidget->count() == 0)
  29.     {
  30.         ui->listWidget->addItem("No connection added");
  31.     }
  32.     ui->listWidget->setFocus();
  33. }
  34.  
  35. dialog1::~dialog1()
  36. {
  37.     delete ui;
  38. }
  39.  
  40. void dialog1::on_btnAdd_new_clicked()
  41. {
  42.     setVisible(false);
  43.     setEnabled(false);
  44.  
  45.     dialog2 *dialogObj1 = new dialog2;
  46.     dialogObj1->exec();
  47.  
  48.     delete dialogObj1;
  49.     setVisible(true);
  50.     setEnabled(true);
  51.     ui->btnAdd_new->setFocus();
  52. }
  53.  
  54. //**************Dialog 2**************************//
  55.  
  56. dialog2::dialog2(QWidget *parent) :
  57.     QDialog(parent),
  58.     ui(new Ui::dialog2)
  59. {
  60.     ui->setupUi(this);
  61.     setParent(MdiArea);
  62.     setWindowTitle("Dialog2");
  63.     setWindowFlags(Qt::FramelessWindowHint);
  64.     setFocusPolicy(Qt::NoFocus);
  65.  
  66.     ui->txtConnectionName->setFocus();
  67. }
  68.  
  69. dialog2::~dialog2()
  70. {
  71.     delete ui;
  72. }
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when i closed the dialog2, dialog1 also comes out of eventloop without closing it....