Hi guys,
I have a QMainWindow. In the menuBar 'Edit' I click "show Dock Widget". The dockWidget appears. Now I want to remove the " restore button" just next to "close button". I tried setting the windows flags but was unsuccessful.

Please help me to remove the restore button displayed on dockWidget.


Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent)
  2. 	: QMainWindow(parent)
  3. {
  4. 	QAction* newAct = new QAction(QIcon(":/images/new.png"), QObject::tr("&New"), this);
  5. 	newAct->setShortcut(QObject::tr("Ctrl+N"));	
  6.  
  7. 	QAction* dockAct = new QAction(QIcon(":/images/cut.png"), QObject::tr("Show Dock Widget"), this);
  8.     dockAct->setShortcut(QObject::tr("Ctrl+D"));
  9.  
  10.     connect(dockAct, SIGNAL(triggered()), this, SLOT(showDockWidget()));
  11.  
  12. 	QMenu *fileMenu = menuBar()->addMenu(QObject::tr("&File"));
  13.     fileMenu->addAction(newAct);
  14.  
  15. 	QMenu *editMenu = menuBar()->addMenu(QObject::tr("&Edit"));
  16.     editMenu->addAction(dockAct);
  17. }
  18.  
  19. MainWindow::~MainWindow()
  20. {}
  21.  
  22. void MainWindow::showDockWidget()
  23. {
  24. 	_dock = new QDockWidget(this);
  25. 	_dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
  26.  
  27. 	_dock->setFeatures (QDockWidget::AllDockWidgetFeatures);
  28. 	_dock->setFloating ( true );	
  29.  
  30. 	QToolButton* btn_1 = new QToolButton();
  31. 	_dock->setWidget( btn_1 );
  32.  
  33. 	//setWindowFlags( Qt::WStyle_Customize|Qt::WStyle_Title );
  34.  
  35. 	_dock->setGeometry( width()/2, height()/2, 100, 30 );		
  36. 	_dock->show();
  37. }
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Thanks