Need help with configuration of codeblocks for Qt !

Question

codeblocks 8.02. , win xp SP2 , Qt 4.6

After installing Qt SDK, I installed QtWorkbench (codeblocks plugin that allows you to create Qt applications.) http://code.google.com/p/qtworkbench/.

I worked under instructions from that page. I opened the folder "dialogs" and in it I opened a new empty codeblocks project. Also in this folder "dialogs" I opened a new directory "complexwizard". In complexwizard is simple main.cpp :

#include <QWidget>
#include <QApplication>
#include <QPushButton>
#include <QLabel>
#include <QDesktopWidget>


class Communicate : public QWidget
{
  Q_OBJECT

  public:
    Communicate(QWidget *parent = 0);

  private slots:
    void OnPlus();
    void OnMinus();

  private:
    QLabel *label;

};


void center(QWidget *widget, int w, int h)
{
  int x, y;
  int screenWidth;
  int screenHeight;

  QDesktopWidget *desktop = QApplication::desktop();

  screenWidth = desktop->width();
  screenHeight = desktop->height();

  x = (screenWidth - w) / 2;
  y = (screenHeight - h) / 2;

  widget->move( x, y );
}


Communicate::Communicate(QWidget *parent)
 : QWidget(parent)
{
  int WIDTH = 350;
  int HEIGHT = 190;

  resize(WIDTH, HEIGHT);

  QPushButton *plus = new QPushButton("+", this);
  plus->setGeometry(50, 40, 75, 30);

  QPushButton *minus = new QPushButton("-", this);
  minus->setGeometry(50, 100, 75, 30);

  label = new QLabel("0", this);
  label->setGeometry(190, 80, 20, 30);

  connect(plus, SIGNAL(clicked()), this, SLOT(OnPlus()));
  connect(minus, SIGNAL(clicked()), this, SLOT(OnMinus()));


  center(this, WIDTH, HEIGHT);

}

void Communicate::OnPlus()
{
  int val = label->text().toInt();
  val++;
  label->setText(QString::number(val));
}

void Communicate::OnMinus()
{
  int val = label->text().toInt();
  val--;
  label->setText(QString::number(val));
}



int main(int argc, char *argv[])
{

  QApplication app(argc, argv);

  Communicate window;

  window.setWindowTitle("Communicate");
  window.show();



  return app.exec();
}

Then I added, "main.cpp" in a blank project and all configured according to the instructions from that page.

When I started to compile the program, compiler always says:

* It seems that this project has not been built yet. Do you want to buid it now? *

I press yes an got this message :

Process terminated with status 2 (0 minutes, 0 seconds) 0 errors, 0 warnings

In the folder "dialogs" where is a project, new files are created:

complexwizard.pro

Makefile.complexwizard

Makefile.complexwizard.Debug

Makefile.complexwizard.Release

Since I am relatively new to the world of programming, compiler and other things, this does not tell me much.

Therefore, I ask someone who has some suggestion on the basis of these symptoms to help me remove it from standstill. If you're interested, I'll add more data that will need