Where is my QPushButtons

Code:

---

Test::Test(QWidget* parent):QDialog(parent)
{
  	setBackgroundRole(QPalette::Dark);
    setAutoFillBackground(true);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 
    //buttons settings
    settingButton=new QPushButton;
    settingButton->setText("settings");
    settingButton->adjustSize();
  	oneStepButton=new QPushButton;
  	oneStepButton->setText("one step");
  	oneStepButton->adjustSize();
  	runAllButton=new QPushButton;
  	runAllButton->setText("run all");
  	runAllButton->adjustSize();
  	//place the buttons in a proper position
  	settingButton->move(5, 5);
    oneStepButton->move(5 + settingButton->width() + 5, 5);
    runAllButton->move(15+settingButton->width()+oneStepButton->width(),5);
 
    //plotter settings
    minX = 0.0;
    maxX = 10.0;
    numXTicks = 5;
 
    minY = 0.0;
    maxY = 10.0;
    numYTicks = 5;    
 
    iniPoints();  
    resize(600,400);  
}
 
void Test::refreshPixmap()
{
    pixmap = QPixmap(size());
    pixmap.fill(this, 0, 0);
 
    QPainter painter(&pixmap);
    painter.initFrom(this);
    drawGrid(&painter);
    drawPoints(&painter);
    update();	
}

---

In this program, I want to draw a coordinate and points in it. above the coordinate, I post three QPushButtons . Now my app can be executed, but the buttons can not turn up, leaving only the coordinate. I don't know why? Do you have any advise?

Thanks!

settingButton->show();
oneStepButton->show();
runAllButton->show();


I add these three lines in the constructor function. but the button post in the leftup corner, not in the dialog.

make the dialog as the parent of the buttons

maybe it would be better to use one of the layouts classes to manage controls position insted of using?

Code:

---

...
settingButton->move(5, 5);
oneStepButton->move(5 + settingButton->width() + 5, 5);
runAllButton->move(15+settingButton->width()+oneStepButton->width(),5);
...

---

:)

settingButton=new QPushButton(this);

it works!

thanks