QT - Problem connecting slot

//*************************************************************************
MainImpl.CPP
//*************************************************************************
#include "ui_gpibmenu.h" //Ui_gpibmenu's main class is  "MainWindow", sorry about the poor naming scheme
#include <QWidget>
#include <QPushButton>
 
MainImpl::MainImpl(QWidget *parent)
    :QWidget(parent)
{
	//setupUi(this);  //This doesn't work, but the example says it should
	QWidget:connect(pushButtonInitDevice, SIGNAL(clicked()), this, SLOT(initButtonPress()));
 
}
 
void MainImpl::initButtonPress()
{
	cout << "GUI IS WORKING!!!" << endl; //This usually outputs the text to the command window of KDevelop
}
//*************************************************************************
//*************************************************************************
 
 
//*************************************************************************
// Main.cpp
//*************************************************************************
#include <QApplication>
#include <QtGui>
#include <QWidget>
#include <QMainWindow>
#include "mainimpl.h"
int main(int argc, char *argv[])
{
 	QApplication app(argc, argv);
	//QWidget *widget = new QWidget();
	QMainWindow * window = new QMainWindow();
	Ui::MainWindow ui;
	ui.setupUi(window);
	window->show();
	return app.exec();
 
 
 
}
//*************************************************************************
//*************************************************************************
 
 
 
 
 
//*************************************************************************
// MainImpl.h
//*************************************************************************
#ifndef MAINIMPL_H
#define MAINIMPL_H
 
#include "ui_gpibmenu.h"
 
class MainImpl: public QWidget, private Ui::MainWindow
{
Q_OBJECT
public:
    MainImpl(QWidget *parent = 0);
public slots:
    void initButtonPress();
private:
    Ui::MainWindow ui;
};
 
#endif
 
//*************************************************************************