Hi Qt developers,

I wrote a simple Qt4 code to get a QMainWindow with Partial Transparent Background and Custom Shape..
Here the core of my application:

Qt Code: 
  1. setMask((new QPixmap("logoic_big.png"))->mask());
  2.  
  3. 	QPalette* palette = new QPalette();
  4. 	palette->setBrush(QPalette::Background,*(new QBrush(*(new QPixmap("logoic_big.png")))));
  5. 	setPalette(*palette); 	
  6.  
  7. 	setWindowFlags(Qt::FramelessWindowHint); 	 
  8.  	QWidget *centralWidget = new QWidget(this);
  9.  	QGridLayout *layout = new QGridLayout();
  10.  
  11.  	centralWidget->setLayout(layout);
  12.  
  13. 	QPushButton* m_showAddCommentButton = new QPushButton();
  14. 	m_showAddCommentButton->setFlat(true);
  15. 	m_showAddCommentButton->setAutoFillBackground(true);
  16. 	m_showAddCommentButton->setFixedSize(40,40);
  17. 	QPalette palett = m_showAddCommentButton->palette();
  18. 	palett.setColor(QPalette::Button,QColor(Qt::transparent));
  19. 	m_showAddCommentButton->setPalette(palett);
  20. 	m_showAddCommentButton->setIcon(QIcon("exit.png"));
  21. 	m_showAddCommentButton->setIconSize(QSize(40,40));
  22. 	m_showAddCommentButton->setToolTip("Close");
  23.  
  24. 	layout->addWidget(m_showAddCommentButton,0,0);
  25.  
  26.  	setCentralWidget(centralWidget);
  27.  
  28. 	connect(m_showAddCommentButton, SIGNAL(clicked()), this, SLOT(close()));
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My question is:
How can I put buttons in a specified positon, that I like, of my custom shape QmainWindows ?

Many thanks in advance..
roby