I found in the web, than the problem is the xubuntu used on my pc.
Then recomend me configure the gnome with:
gconftool-2 --type Boolean --set /desktop/gnome/interface/menus_have_icons True
but all are equall.
I have a doubt with where establish the files ".png" if it should be on "sources" or "Other Files".
I did put on "Other Files", but.... Is this correct?
it seems to had read that I should put it under source, if this is right, could you explain me, how do i put
the files ".png" under "source"?

the program is:

@#ifndef ANOTHERMENU_H
#define ANOTHERMENU_H

#include <QMainWindow>
#include <QApplication>

class AnotherMenu : public QMainWindow
{
public:
AnotherMenu(QWidget *parent = 0);
};

#endif // ANOTHERMENU_H
@
@#include "anothermenu.h"
#include <QMenu>
#include <QMenuBar>

AnotherMenu::AnotherMenu(QWidget *parent)
: QMainWindow(parent)
{
QPixmap newpix("new.png");
QPixmap openpix("open.png");
QPixmap quitpix("quit.png");

QAction *newa = new QAction(newpix, "&New", this);
QAction *open = new QAction(openpix, "&Open", this);
QAction *quit = new QAction(quitpix, "&Quit", this);
quit->setShortcut(tr("CTRL+Q"));

QMenu *file;
file = menuBar()->addMenu("&File");
file->addAction(newa);
file->addAction(open);
file->addSeparator();
file->addAction(quit);

connect(quit, SIGNAL(triggered()), qApp, SLOT(quit()) );

}

@

@#include "anothermenu.h"

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

AnotherMenu window;

window.resize(550, 400);
window.move(300, 300);
window.setWindowTitle("Another Menu");
window.show();


return a.exec();

}@

All function Ok, less appear the icons.
Thanks in advance