Создание нового объекта в слоте.

#include "ctf.h"
#include "ui_ctf.h"
#include <QtGui>
#include <QWidget>
 
CTF::CTF(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::CTF)
{
    ui->setupUi(this);
    connect(ui->action, SIGNAL (triggered()), this, SLOT (CreateNewTest()));
}

void CTF::CreateNewTest()
{
 QComboBox *TypeOfQuochtBox=new QComboBox;
 
 
}

TypeOfQuochtBox->show()

TypeOfQuochtBox=new QComboBox(this)

QComboBox *TypeOfQuochtBox=new QComboBox;

TypeOfQuochtBox=new QComboBox;

#ifndef CTF_H
#define CTF_H
#include <QtGui>
#include <QMainWindow>
 
namespace Ui {
    class CTF;
}
 
class CTF : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit CTF(QWidget *parent = 0);
    ~CTF();
 
private:
    Ui::CTF *ui;
 
public slots:
  void CreateNewTest();
 
};
 
#endif // CTF_H

#include "ctf.h"
#include "ui_ctf.h"
#include <QtGui>
#include <QWidget>
 
CTF::CTF(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::CTF)
{
    ui->setupUi(this);
    connect(ui->action, SIGNAL (triggered()), this, SLOT (CreateNewTest()));
}
void CTF::CreateNewTest()
{
 ui->TypeOfQuochtBox->show();
 
 
}
CTF::~CTF()
{
    delete ui;
}

#ifndef CTF_H
#define CTF_H
#include <QtGui>
#include <QMainWindow>
 
namespace Ui {
    class CTF;
}
 
class CTF : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit CTF(QWidget *parent = 0);
    ~CTF();
 
private:
    Ui::CTF *ui;  
    QComboBox *TypeOfQuochtBox;
 
public slots:
  void CreateNewTest();
 
};
 
#endif // CTF_H

#include "ctf.h"
#include "ui_ctf.h"
#include <QtGui>
#include <QWidget>
 
CTF::CTF(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::CTF)
{
    ui->setupUi(this);
    TypeOfQuochtBox = new QComboBox(this);
    TypeOfQuochtBox->setVisible( false );    
    connect(ui->action, SIGNAL (triggered()), this, SLOT (CreateNewTest()));
}
void CTF::CreateNewTest()
{
 TypeOfQuochtBox->show();
}
CTF::~CTF()
{
    delete ui;
}

void CTF::CreateNewTest()
{
 groupBox->addWidget(TypeOfQuochtBox);
 TypeOfQuochtBox->show();
 
 
}

void CTF::CreateNewTest()
{
 TypeOfQuochtBox->show();
 
 
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow), TypeOfQuochtBox(new QComboBox(this))
{
    ui->setupUi(this);
    grid = new QGridLayout;
    TypeOfQuochtBox->setVisible( false );
    grid->addWidget( TypeOfQuochtBox );
    ui->groupBox->setLayout( grid );
    connect( ui->pushButton, SIGNAL(clicked(void)), SLOT(onClick(void)) );
}
 
void MainWindow::onClick(){
    TypeOfQuochtBox->show();
}
 
MainWindow::~MainWindow()
{
    delete grid;
    delete TypeOfQuochtBox;
    delete ui;
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QComboBox>
#include <QGridLayout>
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots:
    void onClick();
private:
    Ui::MainWindow *ui;
    QComboBox* TypeOfQuochtBox;
    QGridLayout *grid;
};
 
#endif // MAINWINDOW_H

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    connect( ui->pushButton, SIGNAL(clicked(void)), SLOT(onClick(void)) );
}
 
void MainWindow::onClick(){
   TypeOfQuochtBox  = new QComboBox(this); 
   TypeOfQuochtBox->setVisible( false );
   grid->addWidget( TypeOfQuochtBox );
   ui->groupBox->setLayout( grid );
   TypeOfQuochtBox->show();
}